OAO

OAO Orbiting Astronomical Observatory 欧奥（轨道天文观测站）

OAO Opticians Association of Ohio 在俄亥俄州的眼科大夫协会

OAO On-line Analog Output 联机模拟输出

OAO Ontario Association of Orthodontists 安大略协会的便利

OAO Ontario Association of Optometrists 安大略省Optometrists协会

OAO Owned and Operated 拥有和经营

OAO One And Only adj. 唯一的

OAO Over and Out 通话完毕

OAO Otkrytoe Aktsionernoe Obschestvo (Russian: Open Joint Stock Corporation) Otkrytoe Aktsionernoe Obschestvo(俄罗斯:打开股份有限公司)

OAO Orthogonalized Atomic Orbital Orthogonalized原子轨道

OAO Orbital Analysis Officer 轨道分析军官

OAO Office of Academic Opportunities 办公室的机会

OAO Original Art Only 原始的艺术