Office of Cancer Survivorship (National Cancer Institute)办公室的癌症生存(国立癌症研究所) Office of Cyberspace Security (US White House)我们办公室的电脑安全(白宫) Office of Career Services办公室的职业服务 Oracle Collaboration Suite甲骨文协作的套房 Oil Company of Spain, SA石油公司的西班牙,山 Ophthalmic Coding Specialist眼科编码的专家 Order Control System顺序控制系统 Office of Communication Systems办公室的通讯系统 Occupation Control System (railway)职业控制系统(铁路) Office Communications Server (Microsoft)微软办公通信服务器() Orthopedic Clinical Specialist骨科临床专家 Optimum Class Size优化课堂的尺寸 Openconnect SystemsOpenconnect系统 Overhead Catenary/Collector System (transit)接触网/采集系统(交通) Oceanic Control System (air traffic management system used by Airways Corporation of New Zealand Ltd)海洋控制系统(空中交通管理系统所使用的航空公司的新西兰有限公司)