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T&D  Transmission and Distribution
T  Tera (10^12) 
t  Time in seconds
T  Torque 
T  Transformer 
TAB  Technical Advisory Board
TACS  Total Access Communication System  
TAFF  Thermally Activated Flux Flow  
TAP  Tool Application Program  
TAS  Trace analysis system  
TAT  Turnaround time  
TAX  Trunk Automatic Exchange
TB  Tight Binding  
TBC  Time-based competitiveness  
TC  Time constant; temperature coefficient 
TC  ThermoCouple; Time Compression; Temperature Cycle  
TCA  Test Calibration Assembly 
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  Transfer Call Protocol
TCP  Transformer-Coupled Plasma; Tape Carrier Package
TCP  Transmission Control Protocol
TCP/IP  Transmission Control Protocol/Internet Protocol  
TCR  Temperature Coefficient of Resistance  
TCS  Temperature Coefficient Sensitivity  
TCXO  Temperature Compensated Crystal Oscillator  
TD  Thermal Donor(s); Thermal desorption  
TDD  Time Division Duplex
TDDB  Time-dependent dielectric breakdown  
TDEV  Transport-level deviation  
TDM  Time Division Multiplexing
TDMA  Time Division Multiple Access
TDMS  Thermal Desorption Mass Spectrometry  
TDR  Time-Domain Reflectometry  
TD-SCDMA  Time Division Synchronous Code-Division Multiple-Access  
TE  Tail End; Transmitted Electron  
TE  Transverse electric 
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  
TES  Two Electron Satellite  
TFC  Total Fault Coverage; Thin Film Capacitor  
TFE  Tetrafluorethylene (teflon)  
TFED  Thin Film Electroluminescent Display  
TFMSL  Thin Film Micro Strip Line  
TFN  Thin Film Network  
TFR  Terrain Following Radar; Thin Film Resistor  
TFT  Thin Film Transistor
TFX  Toxic effects  
TGA  Thermal gas analysis; TrueVision Targa image format  
TH  Through hole  
THC  Total hydrocarbons  
THEED  Transmission High Energy Electron Diffraction  
THT  Two Hole Transition; Through hole technology  
TIF  Tagged Image File image format  
TIFF  Tag Image File Format 
TIR  Total indicator runout; Total internal reflection  
TIS  Tool induced shift  
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  Transport Module; Transition Metal 
TM  Transverse magnetic
TMA  Thermo mechanical analyzer;
TMC  Transport module controller; Transfer module controller  
TML  Total mass loss  
TMO  Telegraphic Money Order
TNC  Threaded Neill Concelman connector  
TO  Transistor outline package  
TOA  Take-off angle  
TOC  Total organic carbon; Total oxidizable carbon  
TOI  Third Order Intercept  
TOP  Technical and Office Protocol  
TP  True position  
TPD  Temperature program desorption  
TPG  Test pattern generation  
TPM  Total Productive Maintenance; Total Productive Manufacturing  
TPMS  Tire Pressure Monitoring System  
TPMS  Tyre Pressure Monitoring Sensors
TPRS  Temperature programmed reaction spectroscopy  
TPU  Thermal processing unit  
TQ  Total quality  
TQFP  Thin Quad Flat Pack  
TQM  Total Quality Management
TR  Transmit-receive 
TRACT  Transportable Remote Area Communications Terminal
TRF  Transition Reflection Formalism  
TRIM  Transport of Ions in Matter  
TRL  Through Reflect Line  
TRON  The Realtime Operation System Nucleus  
TS  Transport Stream  
TSC  Thermally Stimulated Current  
TSCA  Toxic Substances Control Act  
TSCAP  Thermally Stimulated CAPacitance  
TSFZ  Traveling Solvent Floating Zone  
TSI  Time Slot Interchanger   
TSOP  Thin Small Outline Package
TSP  Temperature-sensitive parameter  
TSSOP  Thin Shrink Small Outline Package  
TT  Technology trasnsfer  
TTA  Telecommunications Technology Association  
TTC  Telecommunication Technology Committee  
TTD  True Time Delay  
TTL  Transistor-transistor logic 
TTL  Through the lens  
TTV  Total thickness variation  
TV  Tele Vision
TVAC  Thermal VACuum (chamber)  
TVRO  TV Receive Only  
TVS  Triangular voltage sweep  
TWA  Time-weighted average  
TWG  Technical Working Group  
TWT  Traveling wave tube 
TXRF  Total X-ray fluorescence  
T/C  Thermocompression  
T/S  ThermoSonic  
T1  1,544 Mb/s
T3  44,736 Mb/s
Ta  Tantalum  
temp  Temperature
tera 10^12
THz  Terahertz 
T-M  Time-to-market  
ToD  Time of Day  
ToR  Top of range  
ToS  Type of Service  
TOW  Tube-launched, Optical-tracked, Wire-guided (Missile)