| Full Form | Category | Term |
|---|---|---|
| Corporation for Open Systems | Computer and Networking | COS |
| Class of Service | Networking | COS |
| Common Object Services | Networking | COS |
| Central Operating System | Networking | COS |
| Cost of Service | Networking | COS |
| Collaborative Operating System | Softwares | COS |
| Computer Operating System | Softwares | COS |
| Comet Operating System | Softwares | COS |
| Corba Object Service | Softwares | COS |
| Carousel Object Store | Softwares | COS |
| Change of Subject | Messaging | COS |
| Cosmic Origins Spectrograph | Space Science | COS |
| Carry-on Oxygen System | Space Science | COS |
| Control Operating System | Space Science | COS |
| Co-orbiting Satellite | Space Science | COS |
| Cosine | Space Science | COS |
| Chief of Security | Job Title | COS |
| Computer Operations Specialist | Job Title | COS |
| Colorado Springs (co) | Airport Code | COS |
| Certified Occupancy Specialist | Certifications | COS |
| College of Sciences | Educational Institute | COS |
| College of The Sequoias | Educational Institute | COS |
| Change of State | Physics Related | COS |
| Certificate of Occupancy | Real Estate | COS |
| Chamber of Secrets | Sports | COS |
| Critical Operational Specialties | Military and Defence | COS |
| Corps Support | Military and Defence | COS |
| Communications Segment | Military and Defence | COS |
| Civilian Occupational Specialty | Military and Defence | COS |
| Contingency Operating Station | Military and Defence | COS |
| Covert Organization Search | Military and Defence | COS |
| Champions of The Sea | Military and Defence | COS |
| Chief of Staff | Military and Defence | COS |
| Chief of Supply | Military and Defence | COS |
| Company Orderly Sergeant | Military and Defence | COS |
| Critical Occupational Specialty | Military and Defence | COS |
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