| SR | SHORT NAME | FULL NAME |
| 1 | AD | Active Directory |
| 2 | ADC | Analog Digital Converter |
| 3 | ARP | Address Resolution Protocol |
| 4 | ASP | Active Server Page |
| 5 | AH | Active Hub |
| 6 | AI | Artificial Intelligence |
| 7 | AL | Active Link |
| 8 | ALGOL | Algorithmic Language |
| 9 | ALU | Arithmetic Logic Unit |
| 10 | AM | Active Monitor |
| 11 | ANSI | American National Standard Institude |
| 12 | APCI | Application-Layer Protocol Control Information |
| 13 | API | Application Program Interface |
| 14 | ASCII | American Standard Code for Information Interchange |
| 15 | ATM: | Automatic Teller Machine |
| 16 | ADF | Automatic Document Folder |
