| T1 | 1,544 Mb/s |
| T3 | 44,736 Mb/s |
| Ta | Tantalum |
| TAB | Technical Advisory Board; Tape automated bonding |
| TAFF | Thermally Activated Flux Flow |
| TAP | Tool Application Program |
| TAS | Trace analysis system |
| TAT | Turnaround time |
| Tb | Terbium |
| TB | Tight Binding |
| TBA | Tertiary-Butyl Arsine |
| TBAH | Tetrabutylammonium hydroxide |
| TBC | Time-based competitiveness |
| TBP | Tertiary-Butyl Phosphine |
| Tc | Technetium |
| TC | Time constant; Temperature coefficient; Thermocouple |
| T/C | Thermocompression |
| TCA | Test calibration assembly; 1,1,1-trichloroethane; Trichloroethate |
| TCAD | Technology computer-aided design |
| TCC | Tactical cell controller; Temperature coefficient of capacitance |
| TCDM | Tool development cost model |
| TCE | Temperature coefficient of expansion |
| TCI | Tele-Communications, Inc. |
| TCM | Tunneling current microscopy |
| TCN | Transparent Content Negotiation |
| TCO | Total Cost of Ownership |
| TCP | Transformer-Coupled Plasma; Tape Carrier Package; Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TCR | Temperature Coefficient of Resistance |
| TCS | Temperature Coefficient Sensitivity |
| TD | Thermal Donor(s); Thermal desorption |
| TDD | Time Division Duplex |
| TDDB | Time-dependent dielectric breakdown |
| TDEAT | Tetrakis (diethylamino) titanium |
| TDEV | Transport-level deviation |
| TDMAT | Tetrakis (dimethylamido) titanium |
| TDMS | Thermal Desorption Mass Spectrometry |
| TDR | Time-Domain Reflectometry |
| TDS | Thermal Desorption Spectroscopy |
| TD-SCDMA | Time Division Synchronous Code-Division Multiple-Access |
| Te | Tellurium |
| TE | Tail End; Transverse electric; Transmitted electron |
| TEA | Transverse excited atmosphere |
| TEC | Thermal expansion coefficient; Test and Electrical Characterization; Thermo electric coolers |
| TECAP | Transistor electrical characterization and analysis program |
| TED | Transient enhanced diffusion; transmitted electron detection |
| TEG | Technical exchange group |
| TEGFET | Two-dimensional Electron Gas Field-Effect Transistors |
| TEM | Transmission Electron Microscopy; Tunneling Electron Microscopy; Transverse electromagnetic mode |
| TEOS | Tetraethoxysilane; Tetraethylorthosilicate; Tetraethelorthosilicate |
| tera | 1.00E+12 (1,000,000,000,000/1; symbolized by the prefix T) |
| TES | Two Electron Satellite |
| TFA | Tree-based Floorplanning Algorithm |
| TFC | Total fault coverage |
| TFE | Tetrafluorethylene (teflon) |
| TFED | Thin Film Electroluminescent Display |
| TFED | Thin Film Electroluminescent Display |
| TFR | Terrain Following Radar |
| TFT | Thin Film Transistors |
| TFX | Toxic effects |
| TG | ThermoGravimetry |
| TGA | Thermal gas analysis; thermal gravimetric analysis; TrueVision Targa image format |
| Th | Thorium |
| TH | Through hole |
| THC | Total hydrocarbons |
| THEED | Transmission High Energy Electron Diffraction |
| THT | Two Hole Transition; Through hole technology |
| Ti | Titanium |
| TIBA | Triisobutlaluminum |
| TIF | (aka TIFF) Tagged Image File image format |
| TIR | Total indicator runout; Total internal reflection |
| TIS | Tool induced shift |
| Tl | Thallium |
| TLC | Thin layer chromatography |
| TLE | Tool loading elevator |
| TLM | Tape-laying machine; Telemeter; Transition line model |
| TLS | Transport Layer Security |
| TLV | Threshold limit value |
| TLV/TWA | Threshold limit value/time-weighted average |
| Tm | Thulium |
| TM | Transport module; Transition Metal |
| T-M | Time-to-market |
| TMA | Thermo mechanical analyzer; TriMethylAluminum |
| TMB | Trimethylborate |
| TMC | Transport module controller; Transfer module controller |
| TMG | Tri-Methyl Gallium |
| TML | Total mass loss |
| TMP | Trimethylphosphate |
| TO | Transistor outline package |
| TOA | Take-off angle |
| TOC | Total organic carbon; Total oxidizable carbon |
| ToD | Time of Day |
| TOF | Time of Flight |
| TOP | Technical and Office Protocol |
| TOR | Top of range |
| ToS | Type of Service |
| TOW | Tube-launched, Optical-tracked, Wire-guided (Missile) |
| TP | True position |
| TPD | Temperature program desorption |
| TPG | Test pattern generation |
| TPM | Total productive maintenance; Total productive manufacturing |
| TPRS | Temperature programmed reaction spectroscopy |
| TPU | Thermal processing unit |
| TQ | Total quality |
| TQFP | Thin Quad Flat Pack |
| TQM | Total quality management |
| TRF | Transition Reflection Formalism |
| TRIM | Transport of Ions in Matter |
| TRON | The Realtime Operation System Nucleus |
| T/S | Thermosonic |
| TS | Transport Stream |
| TSC | Thermally Stimulated Current |
| TSCA | Toxic Substances Control Act |
| TSCAP | Thermally Stimulated CAPacitance |
| TSFZ | Traveling Solvent Floating Zone |