ABBS
Apple Bulletin Board System
ABS
Alternative Billing Service
ABS
Analysis By Synthesis
AA
American national standard code for information interchange (ASCII) Art
AASP
American national standard code for information interchange (ASCII) Asynchronous Support Package
ABTS
American standard code for information interchange (ASCII) Block Terminal Services
ACE
American national standard code for information interchange (ASCII) Compatible Encoding
AES
Advanced Encryption Standard