ACIS
ACademic Information Systems
ACIS
American Committee for Interoperable Systems
CCIS
Common Channel Interoffice Signaling
CCIS
Command and Control Information System
A-SIT
Austrian Security Information Technology center
AA
American national standard code for information interchange (ASCII) Art
AASP
American national standard code for information interchange (ASCII) Asynchronous Support Package
ABS
Alternative Billing Service