| Acronym | Definition |
|---|
| RCOS➣Route Clearance Optics Suite (US DoD) |
| RCOS➣Remote Control Operator Station (industrial engineering) |
| RCOS➣Reformed Church of Satan (various locations) |
| RCOS➣Reform Congregation Oheb Sholom (Pennsylvania) |
| RCOS➣Routing Class of Service |
| RCOS➣Rotary Club of Seminole (Florida) |
| RCOS➣Roman Catholic Orphan School (Australia; 1841-1886) |
| RCOS➣Reading Civic Opera Society (Reading, PA) |