| CODE | ABBREVIATION |
| D | Data channel (ISDN) |
| D&C | Duck & Cover |
| D/A | Digital to Analog / Digital-Analog |
| D/L | Download transmit to you |
| d:-) | Wearing a Cap |
| d00d | dude |
| D2T2 | Dye Diffusion Thermal Transfer |
| DA | Data Available / Desk Accessory / Destination Address / Digital Audio / Directory Assistance |
| DAA | Data Access Arrangement |
| DAAC | Distributive Active Archive Center |
| DAC | Digital Analog Converter / Dual Attachment Concentrator |
| DACC | Directory Assistance Call Completion |
| DACD | Directory Access Control Domain |
| DACS | Digital Access Cross-connect System / Directory Assistance Charging System |
| DAD | Draft Addendum |
| DADC | Digital Audio Disc Corporation |
| DAEMON | Disk And Execution Monitor |
| DAF | Directory Authentication Framework |
| DAG | Defense Agencies Group |
| DAIS | Distributed Automatic Intercept System |
| DAK | Data Acknowledge / Dead At Keyboard |
| DAL | Data Access Language / Data Access Line |
| DALNET | DA Lamers Net |
| DAM | Data Access Manager |
| DAMA | Data Assigned Multiple Access / Demand Assigned Multiple Access |
| DAMIFINO | Damn if I know |
| DAMP | Demand Analysis Manufacturing Planning |
| DAN | Departmental Area Network |
| DAO | Data Access Object / Directory Assistance Operator |
| DAP | Data Access Protocol / Directory Access Protocol / Document Application Profile |
| DARC | Division Alarm Recording Center |
| DARFC | Ducking And Running For Cover |
| DARPA | Defense Advanced Research Projects Agency |
| DART | Data Access and Retrieval Technologies (group) |
| DARTNET | Defense Advanced Research Testbed Network (usually as DARTnet) |
| DARU | DAIS Audio Response Unit / Distributed Automatic Response Unit |
| DAS | Device Access Software / Directory Assistance System / Disk Array Subsystem / Distributor And Scanner / Dual Attachment Station / Dynamically Assigned Sockets |
| DASD | Direct Access Sotrage Device |
| DASH | Dell Advanced SCSI Host |
| DASP | Digital Assisted Services Program |
| DASS | Design Automation Standards Subcommittee |
| DAS-WAT | Distributor And Scanner - Watch Dog Timer |
| DASWDT | Distributor And Scanner Watch Dog Timer |
| DAT | Digital Audio Tape / Digital Audio Tap / Duplicate Address Test |
| DATAEASE | Doesn't always terminate after exiting and slows everything / Don't attempt to aquire everything always shows errors |
| DATTA | District Attorneys' Technology Theft Association |
| DATU | Direct Access Testing Unit |
| DAV | Data Above Voice |
| DAVE | Do Anything Very Easily |
| DAVID | Digital Audio-Video Interactive Decoder |
| DAX | Developer API eXtensions |
| DB | Database / Decibel (usually as dB) |
| DBA | Adjusted Decibel / Data Base Administrator / Digital Business Architecture / Doing Business As |
| DBAC | Data Base Administration Center |
| DBAS | Data Base Administration System |
| DBC | Data Base Creator / Digital Business Center |
| DBCS | Double - Byte Character Set |
| DBF | Dynamic Beam Forming |
| DBIT | Delivery (confirmation) Bit |
| DBL | DOS Batch Language |
| DBM | DataBase Manager / Decibels per Milliwatt (dBm) |
| DBMS | Data Base Management System |
| DBN | Doing Business Not |
| DBOD | Distribution Board of Directors |
| DBR | DOS Boot Record |
| DBS | DataBase Service / Demand Broadcast System / Direct Broadcast Satellite / Duplex Bus Selector |
| DBTG | DataBase Task Group |
| DBX | Digital Branch Exchange |
| DC | (modem) Data Compression / Data Cartridge / Direct Current / Disconnect Confirm |
| DCA | Defense Communications Agency / Digital Communications Associates Inc. / Document Content Architecture |
| DCAA | Dual Call Auto Answer |
| DCAM | Distributed Computing Application Management |
| DCASR | Defense Contract Administration Services Region |
| DCB | Data Control Block / Directory Cache Buffer |
| DCC | Direct Client to Client / Data Collection Computer / Data Communications Channel / Data Country Code / Digital Compact Cassette / Digital Customer Center / Direct Cable Connection |
| DCD | Data Carrier Detect (signal) |
| DCE | Data Circuit Terminal Equipment / Data Circuit-terminating Equipment / Data Communications Equipment / Distributed Computing Environment |
| DCEC | Defense Communications Engineering Center |
| DCE-RPC | Distributed Computing Environment Remote Procedure Call |
| DCF | Data Communications Function |
| DCH | D Channel Handler |
| DCI | Display Control Interface |
| DCIU | Data Communications Interface Unit |
| DCL | Data Control Language / Digital Command Language |
| DCLU | Digital Carrier Line Unit |
| DCM | Digital Carrier Module |
| DCMS | Distributed Call Measurement System |
| DCMU | Digital Concentrator Measurement Unit |
| DCN | Data Communications Network / Declaration Control Number |
| DCO-CS | Digital Central Office-Carrier Switch |
| DCOM | Distributed Component Object Model |
| DCP | Demand for Critical Parts / Device Color Profile / Digital Communications Protocol / Duplex Central Processor |
| DCPR | Detailed Contuing Property Record (PICS/DCPR) |
| DCPSK | Differential Coherent Phase Shift Keying |
| DCR | Direct Current Resistance |
| DCS | Data Circuit Switches / Defined Context Set / Desktop Color Separation / Desktop Color System / Digital Communication System / Digital Cross-connect System / Distributed Computing System |
| DCSS | Digital Customized Support Services / Discontiguous Shared Segments |
| DCT | Digital Carrier Trunk |
| DCTN | Defense Commercial Telecommunications Network |
| DCTS | Dimension Custom Telephone Service |
| DCU | Digital Credit Union |
| DD | Data Definition / Definition Description (HTML) / Depacketization Delay / Double Density |
| DDA | Disk Drive Adaptor / Domain Defined Attribute |
| DDAP | Digital Distribution of Advertising for Publications |
| DDB | Distributed DataBase |
| DDBMS | Distributed DataBase Management System |
| DDC | Direct Department Calling / Direct Distance Calling |
| DDCF | Distributed Document Component Facility |
| DDCMP | Digital Data Communications Messaging Protocol |
| DDD | Digital Diagnostic Diskette / Direct Distance Dialing |
| DDE | Dynamic Data Exchange |
| DDEML | Dynamic Data Exchange Management Library |
| DDF | Data Description File |
| DDFA | DTC Device File Access (Utilities) |
| DDFII | Data Description File for Information Interchange |
| DDGL | Device Dependent Graphics Layer |
| DDH | Digital Distributed Hardware |
| DDI | Direct Dialing In |
| DDial | Diversi-Dial |
| DDIF | Digital Document Interchange Format |
| DDK | Device Driver Kit |
| DDL | Data Definition Language / Data Description Language / Database Definition Language / Database Description Language / Dynamic Data Link |
| DDM | Distributed Data Management |
| DDN | Defense Data Network / Defense Department Network |
| DDN-NIC | Defense Data Network Network Information Center |
| DDOV | Digital Data Over Voice |
| DDP | Datagram Delivery Protocol / Direct Distribution Panel / Distributed Data Processing |
| DDR | Data descriptive Record |
| DDS | Dataphone Digital Service / Digital Dataphone Service / Digital Data Service / Digital Data System / Digital Data Storage / Digital Distributed Software / Document Distribution Service |
| DDT | Don't Do That / DEC Debugging Tape / Dynamic Debugging Tool |
| DDVT | Dynamic Data Visualization (development) Tool |
| DDX | Distributed Data eXchange |
| DE | Discard Eligibility/Eligible |
| DEA | Data Encryption Algorithm / Drug Enforcement Agency |
| DEB | Directory Entry Block |
| DEBI | DMA Extended Bus Interface |
| DEBIES | DDAP Electronic Business Information Exchange Specification |
| DEC | Do Expect Cuts / Digital Equipment Corporation |
| DECDNS | Digital Equipment Corporation Distributed Name Service (usually as DECdns) |
| DECDTM | Digital Distributed Transaction Manager |
| DECMCC | Digital Equipment Corporation Management Control Center (usually as DECmcc) |
| DECNET | Digital Equipment Corporation Network architecture (usually as DECnet) |
| DECNMS | Digital Network Measurement System |
| DECT | Digital European Cordless Telephone |
| DECTP | Digital Transaction Processing |
| DECUS | Digital Equipment Corporation User's Society |
| DEF | Direct Equipment Failure |
| DEK | Data Encryption Key |
| DEL | Delete (DOS) |
| DEMPR | Digital Equipment Corporation MultiPort Repeater |
| DEN | Digital Echo News |
| DENI | Department of Education for Northern Ireland |
| DEPBA | Digital Exchange Pirate Board Alliance |
| DER | Distinguished Encoding Rules |
| DERP | Defective Equipment Replacement Program |
| DES | Data Encryption Standard / Defense Encryption Standard / Destination End System / Digital Encryption Standard / Distributed End System |
| DES-CBC | Data Encryption Standard - Cipher Block Chaining |
| DESIRE | Directory of European Information Security Standard Requirements |
| DET | Directory Entry Table |
| DETLA | Double Extended Three Letter Abbreviation |
| DEU | Dead - End User |
| DEW | Distant Early Warning (line) |
| dewd | dude |
| DF | Direction Flag / Distributing Frame |
| DFA | Design For Assembly |
| DFD | Data Flow Diagram |
| DFDSS | Data Facility DataSet Services |
| DFEP | Diagnostic Front End Processor |
| DFG | Data Flow Graph |
| DFHSM | Data Facility Hierarchical Storage Manager |
| DFI | Digital Facility Interface |
| DFL | Distributed Feedback Layer |
| DFLA | Damn Four Letter Acronym |
| DFM | Design For Manufacturing |
| DFMS | Digital Facility Management System |
| DFN | Deutsches Forschungsnetz |
| DFP | Digital Free Press / District Focus Person |
| DFR | Document Filing and Retrieval |
| DFS | Distributed File Service / Distributed File System |
| DFSK | Differential Frequency Shift Keying |
| DFSMS | Data Facility Sotrage Management Subsystem |
| DFT | Design for Test(ing) / Distributed Function Terminal |
| DFWMAC | Distributed Foundation Wireless Medium Access Control |
| DGITA | Digital Graphic Imaging Technical Association (previously SGAUA) |
| DGPS | Differential Global Positioning System |
| DG-UX | Data General UniX |
| DH | Dear Husband (also Dear Hubby Duh Hubby and of course Dick Head) |
| DHA | Destination Hardware Address |
| DHCP | Dynamic Host Configuration Protocol |
| DHHS | Department of Health and Human Services |
| DHT | Directory Hash Table |
| DHTML | Dynamic HyperText Markup Language |
| DI | Delete Inhibit / Destination Index |
| DIA | Defense Intelligence Agency / Document Interchange Architecture |
| DIAC | Directions and Implications of Advanced Computing |
| DIAFYO | Did I Ask For Your Opinion |
| DIAG | Datasets Inter Agency Group |
| DIAL | Digital Idle Asset Listing |
| DIB | Device Independent Bitmap (graphic format) / Directory Information Base |
| DIBI | Device Independent Backup Interface |
| DIBOL | DIgital Business Oriented Language |
| DIC | Digital Interface Controller |
| DICE | Digital Interactive Consumer Electronic (machines) |
| DID | Destination ID / Direct Inward Dialing |
| DIDC | Data Input and Distribution Card |
| DIF | Data Interchange Format / Digital Interface Frame / Documentation Interchange Format |
| DIFMOS | Double Injection Floating-gate Metal Oxide Semiconductor |
| DIGEST | Digital Electronic Signature Test (usually as DigEST) |
| DIGI | Deutsche Interessengemeinschaft Internet (German Special Interest Group for Internet) |
| DIGL | Device Independent Graphics Layer |
| DIIG | Digital Information Infrastructure Guide |
| DIIK | Damned If I Know |
| DILLIGAD | Do I look like I give a darn?! |
| DILLIGAF | Do I look like I give a f*#k?! |
| DILLIGAF? | Do I look like I give a F#%k? |
| DILLIGAFF | Do I look Like I give a Flying Figment? |
| DIM | Data In the Middle / Demand Integration Meeting / Desktop Information Manager |
| DIMA | Data Information Management Architecture |
| DIMM | Dual In-line Memory Module |
| DIN | Deutsche Industrie Norm / Deutsche Ingineering Normilization / Deutsches Institut fur |
| DINS | Digital Information Network Service |
| DIP | Dual In-Line Package |
| DIPE | Distributed Interactive Processing Environment |
| DIR | Directory (DOS) |
| DIS | Defense Investigative Service / Digital Information Systems / Draft International Standard / Dynamic Impedence Stabalization |
| DISA | Data Interchange Standards Association / Defense Information Systems Agency / Direct Inward Switch Access / Direct Inward System Access |
| DISER | Digital Information Systems External Resources |
| DISERF | Data Interchange Standards Education and Research Foundation |
| DISN | Defense Information Systems Network |
| DISOSS | DIStributed Office Support System |
| DISP | Directory Information Shadow Protocol |
| DIT | Directory Information Tree |
| DITUIHIBMSL | Did I Tell You I Hate IBMs Lately |
| DITUILIBMSL | Did I Tell You I Love IBMs Lately |
| DIU | Digital Interface Unit |
| DIW | D-Inside Wire |
| DIX | DEC - Intel - Xerox (connector) |
| DIZ | Description In Zip |
| DJNR | Dow Jones News Retrieval (online service) |
| DL | Download / Data Link / Definition List / Den Leader / Direct Labor / Distribution List |
| DLAMLT | Don't look at me like that! |
| DLC | Data Link Control / Distributed Loop Carrier / Digital Loop Carrier |
| DLCF | Data Link Control Field |
| DLCI | Data Link Connection Identifier/Identification |
| DLCU | Digital Line Carrier Unit |
| DLE | Data-Link Escape (ASCII) |
| DLL | Data Link Layer / Dial Long Lines / Dynamic Link Library |
| DLM | Data Line Monitor / Distributed Lock Manager |
| DLN | Digital Library Network |
| DLO | Data Line Occupied |
| DLOC | Dark Lords Of Chaos |
| DLP | Digital Light Processing |
| DLPI | Data Link Provider Interface |
| DLS | Data Link Services / Dial Line Service / Digital Link Service / Document Library Services |
| DLSAP | Data Link-layer Service Access Point |
| DLSDU | Data Link-layer Service Data Unit |
| DLSW | Data Link SWitching (usually as DLSw) |
| DLT | Digital Linear Tape |
| DLTBBB | Don't Let The Bed Bugs Bite |
| DLTU | Digital Line - Trunk Unit |
| DLU-PG | Digital Line Unit - Pair Gain |
| DLUPG | Digital Line Unit Pair Gain |
| DLVA | Detector Logarithmic Video Amplifier |
| DM | Dead Memory / Delta Modulation / Dimension Modeling / Disconnected Mode / Distributed Management |
| DMA | Direct Memory Access (channel) |
| DMCL | Digital Modem Command Language |
| DMCR | Debug Mode Control Register |
| DMD | Directory Management Domain |
| DMDD | Distributed Multiplexing Distributed Demultiplexing |
| DME | Digital Management Education / Distributed Management Environment |
| DMF | Distributed Management Framework / Distribution Media Floppy / Distribution Media Format |
| DMI | Definition of Management Information / Desktop Management Interface / Digital Multiplexed Interface |
| DML | (SQL) Database Manipulation Language / Data Manipulation Logic |
| DMM | Digital Multi-Meter / District Manufacturing Manager |
| DMO | (SQL) Distributed Management Objects / Domain Management Organization |
| DMOS | Diffusion Metal Oxide Semiconductor / Double-diffused Metal Oxide Semiconductor |
| DMPDU | Derived Medium access control Protocol Data Unit |
| DMS | Data Management System/Services / Defense Messaging System / Digital Multiplex(ed) Switch/System / Diskless Management Service |
| DMSS | Distribution |
| DMT | Design Maturity Test / Discrete MultiTone |
| DMTF | Desktop Management Task Force |
| DMU | Data Manipulation Unit |
| DN | Directory Number / Distinguished Name / Distribution Network / Domain Name / Down |
| DNA | DEC Network Architecture / Defense Nuclear Agency / Digital Named Accounts / Digital Network Architecture / Digital News Associates / Digital Noise Alliance / Distributed Network Architecture / Deoxyribonucleic acid |
| DNC | Dynamic Network Controller |
| DND | Do Not Disturb |
| DNDO | Do Not Disturb Override |
| DNDS | Distributed Network Design System |
| DNHR | Dynamic Non-Hierarchical Routing |
| DNIC | Data Network Identification Code |
| DNIS | Dialed Number Identification Service |
| DNP | Distributed Network Processing |
| DNPM | Darn (Damn) Near Pis*ed Myself |
| DNR | Data Network Routing / Dialed Number Recorder / Digital Number Recorder |
| DNS | Domain Name Service / Domain Naming System / Domain Name System / Domain Name Server |
| DNX | Dynamic Network Cross-Connect (X-connect) |
| DO | Distributed Object |
| DOA | Dead On Arrival / Distributors Of Anarchy |
| DOAM | Distributed Office Applications Model |
| DOC | Department of Communications (in Canada) / Document DOC Department of Communications (in Canada) / Document |
| DOCS | Display Operator Console System |
| DOD | Department of Defense / Direct Outward Dialing |
| DOE | (U.S.) Department Of Energy / Department of Energy |
| DOI | Distributed Object Infrastructure |
| DOJ | Department of Justice |
| DOM | Data On Master (group) / District Operations Manager |
| DOMF | Distributed Object Management Facility |
| DOMS | Distributed Object Management System |
| DOMSAT | Domestic Satellite (service) |
| DON | Department Of the Navy |
| DONACS | Department Of the Navy Automation and Communication System |
| DOP | Directory Operational Protocol |
| DORK | Domestic Organization for Real K???? |
| DOS | Defective Operating System / Disc Operating System / Denial of Service |
| DOSBS | Data Over Speech Bearer Service |
| DOT | (U.S.) Department Of Transportation |
| DOTS | Digital Office Timing Supply |
| DOV | Data Over Voice |
| DOW | Direct Over-Write (technology) |
| DP | Data Processing / Demarcation Point / Dial Pulse / Draft Proposal / Dial Pulse |
| DPA | Demand Protocol Architecture / Distributed Power Architecture / Document Printing Application |
| DPAC | Dedicated Plant Assignment Center |
| DPAM | Demand Priority Access Method |
| DPANS | Draft Proposed American National Standard (usually as dpANS) |
| DPB | Drive Parameter Block |
| DPC | Data Processing Center / Deferred Procedure Call / Destination Point Code / Direct Program Control |
| DPCM | Differential Pulse Code Modulation |
| DPE | Data Path Extender |
| DPG | Dedicated Packet Group |
| DPI | Dot Pitch Integer / Dots Per Inch |
| DPL | Dedicated Private Line |
| DPLL | Digital Phase Locked Loop |
| DPM | Data Processing Manager |
| DPMA | Data Processing Management Association |
| DPMI | DOS Protected Mode Interface |
| DPMS | Display Power Management Signaling / DOS Protected Mode Services |
| DPNPH | Data Packet Network - Packet Handler |
| DPN-PH | Data Packet Network - Packet Handler |
| DPO | Dial Pulse Originating |
| DPP | Discounted Payback Period / District Partner Program |
| DPSC | Defense Personnel Support Center |
| DPSK | Differential Phased Shift Keying |
| DPSS | (Los Angeles County) Department of Public Social Services |
| DPSWG | Digital Privacy and Security Working Group |
| DPT | Dial Pulse Terminating / Distributed Processing Technology |
| DQDB | Distributed Queue Dial Bus |
| DQL | DataEase Query Language |
| DQT | Design Quality Test |
| DR | Data Ready / Data Receive / Delivery Report / Digital Research / Disconnect Request |
| DRAM | Dynamic Random Access Memory |
| DRC | Data Resource Center |
| DRDA | Distributed Relational Database Architecture / Access |
| DR-DOS | Digital Research Disk Operating System |
| DREF | Distribution Research and Education Foundation |
| DRMU | Digital Remote Measurement Unit |
| DRN | Data Routing Network |
| DROOL | Dave's Recycled Object - Oriented Language |
| DRP | DECnet Routing Protocol / Directory Replication Protocol / Distribution Resource Planning |
| DRPF | Decimal Reference Publication Format |
| DRS | Data Rate Selector |
| DRT | Digital Real Time |
| DS | Data Segment / Data System / Digital (carrier) Span / Digital Service / Directory Service / Direct Signal / Digital Signal (level 0 - 3) / Digital Stream (1 |
| DS/DD | Double Sided / Double Density |
| DS/HD | Double Sided / High Density |
| DS0 | Digital Signal (level) Zero |
| DSA | Decimal Shift and Add (algorithm) / Dedicated Switched Access / Destination Software Address / Digital Storage Architecture / Decimal Shift and Add (algorithm) / Directory Service Agent / Directory System Agent / Directory Service Area / Directory System A |
| DSAD | Digital Storage Architecture for Disk |
| DSAP | Data link Service Access Point / Destination Service Access Point |
| DSAT | Digital Storage Architecture for Tape |
| DSB | Double SideBand |
| DSBAM | Double-SideBand Amplitude Module |
| DSBFC | Double SideBand Full Carrier |
| DSBSC | Double SideBand Suppressed Carrier |
| DSC | Data Stream Compatibility / Direct Satellite Communications / Document Structuring Conventions |
| DSD | Data Structure Definistion / Distributed Self Discovery |
| DSDC | Direct Service Dial Capability |
| DSDF | Digital Standard Disk Format |
| DSDS | Dataphone Switched Digital Service |
| DSE | Data Switching Equipment / Distributed Single-layer Embedded / Distributed System Environment / DSA Specific Entry |
| DSI | Data Subscriber Interface / Digital Speech Interpolation |
| DSID | Destination Signaling IDentifier |
| DSIN | Digital Software INformation |
| DSL | Digital Subscriber Line |
| DS'L | Doctor Stein's Laboratories |
| DSLA | Digital Software Licensing Architecture |
| DSLAM | Digital Subscriber Line Access Multiplexer |
| DSLO | Distributed System License Option |
| DSM | Diagnostic System Manager / Digital Standard MUMPS / Distributed Switching Matrix / Distributed Systems Manufacturing / District Sales Manager |
| DSMA | Digital Sense Multiple Access |
| DSMC | Digital Service Monthly Charge |
| DSN | Data Source Name / Defense Switched Network / Digital Services Network / Digital Signal (Level) N |
| DSO | Days Sales Outstanding / Digital Storage Oscilloscope |
| DSOM | Distributed System Object Model |
| DSP | Defense Standardized Profit / Digital Signal Processor / Directory System Protocol / Domain Specific Part |
| DSPU | DownStream Physical Unit |
| DSR | Data Send/Set Ready / Date Set Ready / Dynamic Service Register |
| DSRI | Digital Standard Relational Interface |
| DSS | Data Station Selector / Decision Support System / Digital Satellite System / Digital Signal Standard / Digital Signature Standard / Digital Subscriber Service / Digital Subscriber Signaling / Direct Station Selection / Distributed Security Service |
| DSS/BLF | Direct Station Selection / Busy Lamp Field |
| DSS1 | Digital Subscriber Signaling (system No.) 1 |
| DSSI | Digital Small Storage Interconnect / Digital Storage Systems Interconnect |
| DSSSL | Document Style Semantics and Specification Language |
| DSTAR | Digital System Technical Architecture Research |
| DSTP | Data Source Transfer Protocol |
| DSU | Data Service Unit / Digital Service Unit |
| DSUWG | Data Systems Users Working Group |
| DSVD | Digital Simultaneous Voice and Data |
| DSV-IS | Design Specification and Verification of Interactive Systems |
| DSVIS | Design Specification and Verification of Interactive Systems |
| DSX | Digital Signal Cross-Connect (X-Connect) DSX Digital Signal Cross-Connect (X-Connect) |
| DT | Data Transfer / Data Transmit / Definition Term / Detection Threshold / Dial Tone / Di-group Terminal |
| DT&E | Development Test and Evaluation |
| DTA | Disk Transfer Area |
| DTAM | Document Transfer Access and Manipulation |
| DTAS | Digital Test Access System |
| DTC | Data Technology Corporation / Datacommunications and Terminal Controller / Digital Trunk Controller / Di-group Terminal Controller / Distributed Transaction Coordinator |
| DTD | Document Type Definition |
| DTDS | Disaster Tolerant Disk Systems |
| DTE | Data Terminal Equipment |
| DTF | Dial Tone First |
| DTFS | Direct Tape File System |
| DTG | Direct Trunk Group |
| DTI | Dark Towers International / Department of Trade and Industry / Digital Trunk Interface |
| DTIF | Digital Tabular Interchange Format / Digital Transmission Interface Frame |
| DTMF | Dual Tone Modulation Frequency / Dual-Tone-Multi-Frequency |
| DTN | Digital Telephone Network |
| DTP | DeskTop Publishing / Distributed Transaction Processing |
| DTR | Data Terminal Ready (signal) / Dedicated Token Ring / Draft Technical Report |
| DTRT | Do The Right Thing |
| DTS | Data Transfer System / Deposit Tracking System / Digital Termination Service/System / Digital Transcoding Switch / Digital Transmission System / Distributed Terminal Subsystem / Distributed Time Service |
| DTST | Dial Tone Speed Test |
| DTSX | Data Transport Station for X.25 |
| DTU | Di-group Terminal Unit |
| DTV | Desktop Video |
| DU | Data Unit |
| DUA | Dallas Underground Association / Directory User Agent |
| DUART | Dual Universal Asychronous Receiver Transmitter |
| DUCWIC | Do You See What I See? |
| DUCWIM | Do You See What I Mean? |
| DUHWIH | Do You Hear What I Hear? |
| DUN | Dial-Up Networking |
| DUSR | Digital Authorized Used Systems Resellers |
| DUV | Data Under Voice |
| DUX | Digital Voice eXchange |
| DV | Digital Video |
| DVB | Digital Video Broadcasting |
| DVC | Digital Video Cassette / Digital Video Conference |
| DVD | Digital Versatile Disk / Digital Video Disk |
| DVDROM | Digital Versatile Disk Read Only Memory |
| DVD-ROM | Digital Versatile Disk Read Only Memory |
| DVE | Digital Video Effects |
| DVI | Digital Video Interactive/Interleaved |
| DVM | Data Voice Multiplexor |
| DVMRP | Distance Vector Multicast Routing Protocol |
| DVN | Digital Video Network |
| DVT | Design Verification Test |
| DVX | Digital Voice Exchange |
| DW | Data Warehousing |
| DWCI | DecWindows Compiler Interface |
| DWI | Doc Writers Incorporated |
| DWIM | Do What I Mean |
| DWIMC | Do What I Mean Correctly |
| DWISNWID | Do What I Say Not What I Do |
| DXC | Digital Cross-Connect |
| DXF | Data eXchange Format (graphic format) |
| DXI | Data eXchange Interface |
| DYJHIW | Don't you just hate it when... |
| DYLAN | DYnamic LANguage |
D
DAVP :- Directorate of Advertising and Visual PublicityDCA :- Drug and Cosmetic Act
DCI :- Dredging Corporation of India
DDT :- Dichloro Diphenyle Trichloroethane
DDP :- Desert Development Programme
DFDR :- Digital Flight Data Recorder (Black Box)
DIG :- Deputy Inspector General
D.Lit :- Doctor of Literature
DGCA :- Director General of Civil Aviation
DICGC :- Deposit Insurance and Credit Guarantee Corporation
DIG :- Defence Intelligence Group
DLO :- Dead Letter Office
DGCEI :- Directorate General of Central Excise Intelligence
DM :- District Magistrate
DMK :- Dravida Munetra Kazhagam
DMRL :- Defence Metalurgical Research Laboratory
DNA :- Di-oxyribo Nucleic Acid
DNEM :- Dynamic Numeric Encoding Method
DPAP :- Drought Prone Area Programme
DPCS :- Defence Satellite Communication System
DPC :- Dabhol Power Company
DPCO :- Drug Prices Control Order
DPSA :- Deep Penetration Strike Aircraft
DRDO :- Defence Research and Development Organization
DRI :- Director of Revenue Intelligence
DSP :- Digital Signal Processing
DST :- Department of Science & Technology
DTH :- Direct To Home
DOTS :- Directly Observed Treatment Shortcourse
DVC :- Damodar Valley Corporation
DVD :- Digital Versatile Disk
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