TLA = Three Letter Acronym
EL = Electro Lumincent (spelling)
ECG = A line of replacement components, See NTE
SMPS = switched mode power supply
DVM = Digital voleter
ADC = Analog to Digital converter
CCA = Cold Cranking Amps
FAQ = Frequently asked questions
HDMI = A display connector (High Definition Multimedia Interface )
It supports ethernet, audio, video etc.
SMD = Surface Mount Device
MTU = Maximum transfer unit (TCP/IP)
ECU = Engine Control Unit
RS = Radio Shack or RS Electronics - Need context
ESR = Effective Series Resistance
PSU = Power Suppy Unit
RFID = Radio Frequency Identification
SMPS = (duplicate)
GSM = (telephony term) i.e. GSM modem
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCAQFjAA&url=https://www.acronymfinder.com/GSM.html&ei=dD7qVIHNH_HgsATb5YH4Ag&usg=AFQjCNHwqS4N2PZLmuQwLXyWcccq5DNKoQ&bvm=bv.86475890,d.cWc
FFT = Fast Fourier Transform
MOV = Metal Oxide varistor
FRGA (FPGA maybe) Field Programable Gate Array
DDL - Digital Delay Line
https://www.acronymfinder.com/DDL.html
DMV (context) Department of Motor Vehicles
Take your pick
https://www.acronymfinder.com/DMV.html
The ones I was unclear on, got more info.