| Acronym | Meaning |
 | SPCO | Single-Pole Change Over |
| CHI | Computer-Human Interaction |
| DCCP | Datagram Congestion Control Protocol |
| ACP | Air Control Point |
| UNICEF | United Nations Children's Fund (originally The United Nations International Children's Emergency Fund) |
| AISB | (British Society For The Study Of) Artificial Intelligence And The Simulation Of Behaviour |
| NSA | U.S. National Security Agency - Naval Support Activity - No Strings Attached |
| PRC | People's Republic Of China |
| C2IS OR C?IS | Command And Control Information System |
| ARS | Agricultural Research Service -Argentine Peso (ISO 4217 Currency Code) |
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