ACHEMA
Ausstellung für Chemisches Apparatewesen
RACH
Random Access Cheannel
REACH
Registration, Evaluation, and Authorization of Chemicals
AAX
Automated Attendant eXchange
ABATS
Automated Bit Access Test System
ABR
Automated Beacon Removal
ACCS
Automated Calling Card Service
ACD
Automated/Automatic Call Director/Distributor/Distribution