APDA Alaska Public Defender Agency 阿拉斯加的公众辩护人代理

API After Project Initiation 在项目的开始

APL Apple Public License (Darwin/Mac OS X Open-Source Project) 苹果公共许可证(达尔文/ m aco sx开源项目)

APO Army & Air Force Post Office 陆军和空军邮局

APP Appendix n. 附录, 阑尾

APPL Academy of Program and Project Leadership (NASA) 学院的计划和项目领导(NASA)

APPLE All Punks Please Leave Earth (band) 所有废物请离开地球(带)

APR Agency Procurement Request 代理采购的要求

APS Advanced Photographic System 先进的摄影系统

APU Ashton-Potter (USPS philately) Ashton-Potter(USPS集邮)

AQ Action Quake (gaming team) 地震(游戏团队行动)

AQIS Asian Conference on Quantum Information Science 在量子资讯科学会议

AQL Advanced Quicklook 先进的Quicklook

AR Accounts Receivable 列清单

ARC Address Resolution Client (part of ARP) 解决客户(部分地址ARP)

ARDS Accunet Reserved Digital Service (AT&T) Accunet数字服务(AT&T)保留

ARG Argument n. 辩论, 争论, 论点(据), 理由

ARI Archaeological Research Institute 考古研究所

ARM Anti-Radiation Missile 反辐射导弹

ARP Aerospace Recommended Practice 航天推荐