Open Source Software Institute开源软件学院 Operation Support Systems Interface运营支持系统的接口 Office of Security Services International安全服务国际 Outback Steakhouse, Inc. (stock symbol)内地的牛排餐厅、股份有限公司。(股票符号) Office of Supplemental Security Income (Social Security Administration)办公室的辅助安全的收入(社会保障管理) Outback Steakhouse, Inc.内地的牛排餐厅、股份有限公司 Operating Systems Support and Integration操作系统支持和整合