Fundamentals and Units of Measurement 1677telecommunications room TR
television TV
television interference TVI
temperature differential 'T
temporary threshold shift TTS
tesla T
tetrafluoroethylene TFE
thermal noise TN, itn
thermocouple; time constant TC
thin film transistors TFT
thousand circular mils kcmil
three-pole, double-throw 3PDT
three-pole, single-throw 3PST
time T
time delay spectrometry TDS
time division multiple access TDMA
time division multiplexing TDM
time energy frequency TEF
timebase corrector TBC
ton ton
tonne t
total harmonic distortion THD
total harmonic distortion plus noise THD+N
total sound level in dB LT
total surface area S
transient intermodulation distortion TIM
transistor-transistor logic TTL
transmission control protocol/internet protocol TCP/IP
transmission loss TL
transparent OLED TOLED
transparent organic light Emitting diode TOLED
transverse electric TE
transverse electromagnetic TEM
transverse magnetic TM
traveling-wave tube TWT
TV receive only TVRO
twisted pair-physical medium dependent TP-PMD
ultrahigh frequency UHF
ultraviolet UV
Underwriters Laboratories, Inc. UL
uniform building code UBC
unit interval UI
unit of absorption Sabin
universal disc format UDF
Universal Powerline Association UPA
universal serial bus USBTable 48-9. Recommended Abbreviations
Unit or Term Symbol or
Abbreviationuniversal service order code USOC
unshielded twisted pair(s) UTP
upper sideband USB
user datagram protocol UDP
user defined protocol UDP
vacuum-tube voltmeter VTVM
variable constellation/multitone modulation VC/MTM
variable speed oscillator VSO
variable-frequency oscillator VFO
velocity of propagation VP
vertical-cavity surface-emitting laser VCSEL
very high bit rate digital subscriber line VDSL
very high frequency VHF
very low frequency VLF
vibratory acceleration level La
vibratory force level LF
vibratory velocity level Lv
Video Electronics Standards Association VESA
video graphics array VGA
video home system VHS
video on demand VOD
video RAM VRAM
virtual local area network VLAN
virtual private networks VPN
voice over internet protocol VoIP
voice over wireless fidelity VoWi-Fi
volt V
volt-ohm-milliammeter VOM
voltage (electromotive force) E
voltage controlled crystal oscillator VCXO
voltage gain μ
voltage standing wave ratio VSWR
voltage-controlled amplifier VCA
voltage-controlled oscillator VCO
voltampere VA
volume indicator VI
volume unit VU
watt W
watt per steradian W/sr
watt per steradian square meter W/(sr·m^2 )
watthour Wh
wavelength M
wavelength division multiplexing WDM
weber Wb
weighted modulation transmission function WMTF
wide area network WANTable 48-9. Recommended Abbreviations
Unit or Term Symbol or
Abbreviation