| T-8 hrs | 8 Hours |
| T/V | Thermal Vacuum |
| T&C | Telemetry and Command |
| T&C | Terms and Conditions |
| T&CH | Telemetry and Command Handling |
| T&E | Test and Evaluation |
| T&H | Transition and Handover |
| T&M | Time and Material |
| T3 | Tier 3 (service model) |
| TA | Technical Authority |
| TAA | Technical Assessment Agreements |
| TAC | Technical Advisory Committee |
| TAD4D | Tivoli Asset Discovery for Distributed |
| TADDM | Tivoli Application Dependency Discovery Manager |
| TAF | Technical Aerodrome Forecast |
| TAFB | Tropical Analysis and Forecast Branch |
| TAM | Tivoli Access Manager |
| TAMDAR | Tropospheric Airborne Meteorological Data Reporting |
| TAMIT | Tivoli Asset Management for IT |
| TAP | Technical Advisory Panel |
| TAT | Time-at-Tone (GLM) |
| TB | Terabyte (10E12 bytes) |
| TB | Thermal Balance |
| TBC | To Be Confirmed |
| TBD | To Be Determined |
| TBR | To Be Reviewed |
| TBS | To Be Specified / Supplied |
| TBX | The aggregation of TBD, TBR, TBS |
| TC | Tropical Cyclone |
| TC | Telecommand |
| TC | Temperature Coefficient |
| TC | Test Coupler |
| TC/IFA | Test Coupler / Input Filter Assembly |
| TC/OFA | Test Coupler / Output Filter Assembly |
| TCC | Test Conductor Console |
| TCC | Test Control Center |
| TCFC | Tropical Cyclone Forecast Center |
| TCO | Total Column Ozone |
| TCO | Total Cost of Ownership |
| TCOM | Total Cost of Material |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/internet protocol suite |
| TCPI | To Complete Performance Index |
| TCR | Tivoli Common Reporting |
| TCS | Thermal Control System |
| TD | Test Director |
| TD | Thermal Desktop |
| TDAS | Test Data Analysis System |
| TDD | Test Design Document |
| TDEA | Triple Encryption Algorithm |
| TDM | Time Division Multiplexing |
| TDMA | Time Division Multiple Access |
| TDP | Technical Data Package |
| TDP | Technology Development Plan |
| TDRS | Tracking and Data Relay Satellite |
| TDS | Tivoli Directory Service |
| TDW | Tivoli Data Warehouse |
| TDWR | Terminal Doppler Weather Radar |
| TE | Triple Enterprise |
| TED | Triple Error Detection |
| TEMA | Telemetry Event Macro Activities |
| TEMA | Tivoli Enterprise Monitoring Agent |
| TEMP | Test and Evaluation Master Plan |
| TEMPIR | Temporal Infrared Test |
| TEMS | Tivoli Enterprise Monitoring Server |
| TEP | Tivoli Enterprise Portal |
| TEP | Transport End Point |
| TEPS | Tivoli Enterprise Portal Server |
| TES | Tropospheric Emission Spectrometer |
| TF | Transfer Frame |
| TFLOP | Tera (trillion) Floating Point Operations per Second |
| TFRS | Timing Frequency and Reference System |
| TFTP | Trivial File Transfer Protocol |
| TFTP | Tropopause Folding Turbulence Prediction |
| TGCT | Thermal Gross Contrast Test |
| TH&SA | Transition, Handover, and System Acceptance |
| THC | Total Hydrocarbons |
| TIC | Trusted Internet Connection |
| TID | Total Ionizing Dose |
| TIFDS | Test Inject Intermediate Frequency Distribution Switching (IFDS) |
| TIM | Technical Interchange Meeting |
| TIM | Technical Interface Meeting |
| TIM | Tivoli Identity Manager |
| TIP | Thermal Inspection Procedure |
| TIP | Tivoli Integrated Portal |
| TIR | Thermal Infrared |
| TIROS | Television Infra-Red Observation Satellite |
| TIS | Test Inject Switch |
| TKE | Total Kinetic Energy |
| TKO | Technical Kick Off |
| TLE | Two Line Elements |
| TLM | Telemetry |
| TLMT | Trending and Limit-Monitoring Tool |
| TLS | Transport Layer Security |
| TLYF | Test Like You Fly |
| TM | Technical Manual/Memo |
| TM | Telemetry |
| TM | Thematic Mapper |
| TMI | TRMM Microwave Imager |
| TML | Total Mass Loss |
| TMM | Thermal Math Model |
| TMON | Telemetry Monitoring |
| TMOVS | Modes of Operation Validation System for the Triple Data Encryption Algorithm |
| TMR | Triple Modular Redundancy |
| TMT | Tool, Methodologies, Technology |
| TN | Technical Note |
| TNC | Threaded Neill-Concelman |
| TNCF | Test Network Control Facility (AWIPS) |
| TNPFA | Trivoli Netcool Performance Flow Analyzer |
| TO | Test Objective |
| TO | Transportation Officers |
| TOA | Top Of the Atmosphere |
| TOD | True Of Date |
| TOM | Transition to Operations Manager |
| TOMS | Total Ozone Mapping Spectrometer |
| TOP | Transition to Operations |
| TOPs | Technical Operating Procedures |
| ToR | Terms of Reference |
| ToS | Types of Service |
| TOTO | Total-Totals |
| TP | Test Procedure |
| T-PARC | THORPEX Pacific Asian Regional Campaign |
| TPC | Test Pattern Conversion |
| TPC | Tropical Prediction Center |
| TPM | Technical Performance Measurement |
| TPMS | Technical Performance Measurement System |
| TPW | Total Precipitable Water |
| TQCM | Temperature-Controlled Quartz Crystal Microbalance |
| TRACE | Transition Region and Coronal Explorer |
| TRASYS | Thermal Radiation Analyzer System |
| TRD | Technical Requirements Document |
| TT&C | Telemetry, Tracking, and Command |
| TRD | Technical Requirements Document |
| TRD | Test Requirements Document |
| TRL | Technology Readiness Level |
| TRM | Technical Reference Model |
| TRMM | Tropical Rainfall Measuring Mission |
| TRR | Test Readiness Review |
| TRS | Time and Reference System |
| TRSM | Tivoli Service Request Manager |
| TSA | Thermal Shield Assembly |
| TSA | Tivoli System Automation |
| TSA/MP | Tivoli System Automation / Multi-Platform |
| TSIM | Test Simulator |
| TSM | Tivoli Storage Manager |
| TSMDB | Tivoli Storage Manager Database |
| TSRD | Thermal Subsystem Requirements Document |
| TSRM | Tivoli Service Request Manager |
| TSSR | Transfer Standard Stability Radiometer |
| TT | Total Totals Index (ACP stability index) |
| TT&C | Telemetry, Tracking, and Command |
| TTC | Telemetry, Tracking and Command |
| TTL | Time To Live |
| TTRS | Time to Restore Service |
| TURFTS | TDRSS User RF Test Set |
| TUT | Thermal (11 µm BT) Uniformity Test |
| TV | Thermal Vacuum |
| TVAC | Thermal Vacuum |
| TVDI | Temperature Vegetation Dryness Index |
| TWG | Telemetry Working Group |
| TWH | Technical Warrant Holder |
| TWT | Traveling Wave Tube |
| TWTA | Traveling Wave Tube Assembly |
| TX | Transceiver |
| TXR | Thermal Infrared Transfer Radiometer |