Piggie

ERP = Effective Radiated Power
KW = Kilowatt
db = decibel
NM (db) = Noise Margin decibel
dbm = db compared to microvolt
TPO = Transmitter Power Output
PSIP = Program and System Information Protocol
ATSC = Advanced Television Systems Committee
NTSC = National Television System Committee (also jokingly called Never The Same Color)
PAL = Phase Alternating Line
DVR = Digital Video Recoder
PID = Packet Indentifiers
TVCT = Terrestrial Virtual Channel Table
EIT = Event Information Table
F/B = Front to Back
SNR or S/R = Signal to Noise
DTS = Distributed Transmission System

I am sure I know dozens more but the brain has stopped for the moment.