| Abbreviation | Description |
| Ship Pollution | Protocol of 1978 Relating to the International Convention for the Prevention of Pollution From Ships, 1973 (MARPOL) |
| SICA | Central American Integration System |
| Sparteca | South Pacific Regional Trade and Economic Cooperation Agreement |
| SPC | Secretariat of the Pacific Communities |
| SPF | South Pacific Forum |
| sq km | square kilometer |
| sq mi | square mile |
| TAT | Trans-Atlantic Telephone |
| TEU | Twenty-Foot Equivalent Unit, a unit of measure for containerized cargo capacity |
| Tropical Timber 83 | International Tropical Timber Agreement, 1983 |
| Tropical Timber 94 | International Tropical Timber Agreement, 1994 |
| UAE | United Arab Emirates |
| UDEAC | Central African Customs and Economic Union |
| UHF | ultra-high-frequency |
| UK | United Kingdom |
| UMA | Arab Maghreb Union |
| UN | United Nations |
| UNAMA | United Nations Assistance Mission in Afghanistan |
| UNAMIR | United Nations Assistance Mission for Rwanda |
| UNAMSIL | United Nations Mission in Sierra Leone |
| UNAVEM III | United Nations Angola Verification Mission III |
| UNCLOS | United Nations Convention on the Law of the Sea, also know as LOS |
| UNCRO | United Nations Confidence Restoration Operation in Croatia |
| UNCTAD | United Nations Conference on Trade and Development |
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