SSA

Social Security Administration

IETF

Internet Engineering Task Force

ESO

European Southern Observatory

EPA

Environmental Protection Agency

Xon/Xoff

Computer serial flow control, usually using DC3/DC1 (^S/^Q)

VDU

Video Display Unit

CP/M

Control Program / Monitor

LPTV

Low-Power TV (broadcasting)

VHS

Video Home System (VCR)

NORAD

NORth American Defense Command

RLV

reusable launch vehicle

CTT

Commander's Tactical Terminal

xmt

Transmit mode

API

application program interface

BNCR

Blimped Noiseless Camera, Reflex

PM&C

Program Management & Control