A/D/P - Analysts / Designers / Programmers

A/UX - Apple's version of Unix

AA - Attribute Association Function

AAAP - Autodesk Animator and Animator Pro

AAB - All-to-all Broadcast

AACR - Anglo - American Cataloguing Rules

AAER - Accounting and Auditing Enforcement Releases

AAL - ATM Adaptation Layer

AAP - Association of American Publishers

AAP - Applications Access Point

AAR - Addition Accumulation Register

AAS - All-to-all Scatter

AASP - ASCII Asynchronous Support Package

AAT - Average Access Time

AAUP - American Association of University Presses

AB - Average BIOS

ABC - Adaptive Binary Coder

ABC - American Broadcast Company

ABC - Abstract Base Class

ABC - Atanasoff-Berry Computer

ABCDCM - Abstract Base Class Derived Class Method

ABCM - Abstract Base Class Method

ABED - Algorithm - Based Error Detection

ABEND - Abnormal End

ABFT - Algorithm Based Fault tolerance