| Abbreviation | Description |
| Antarctic-Environmental Protocol | Protocol on Environmental Protection to the Antarctic Treaty |
| Antarctic-Marine Living Resources | Convention on the Conservation of Antarctic Marine Living Resources |
| ANZUS | Australia-New Zealand-United States Security Treaty |
| APEC | Asia-Pacific Economic Cooperation |
| Arabsat | Arab Satellite Communications Organization |
| ARF | ASEAN Regional Forum |
| AsDB | Asian Development Bank |
| ASEAN | Association of Southeast Asian Nations |
| AU | African Union |
| Autodin | Automatic Digital Network |
| BA | Baltic Assembly |
| bbl/day | barrels per day |
| BCIE | Central American Bank for Economic Integration |
| BDEAC | Central African States Development Bank |
| Benelux | Benelux Economic Union |
| BGN | United States Board on Geographic Names |
| BIMSTEC | Bay of Bengal Iniative for Multisectoral Technical and Economic Cooperation |
| Biodiversity | Convention on Biological Diversity |
| BIS | Bank for International Settlements |
| BSEC | Black Sea Economic Cooperation Zone |
| C | Commonwealth |
| c.i.f. | cost, insurance, and freight |
| CACM | Central American Common Market |
| CAEU | Council of Arab Economic Unity |
| CAN | Andean Community of Nations |
| Caricom | Caribbean Community and Common Market |
| CB | citizen's band mobile radio communications |
| CBSS | Council of the Baltic Sea States |
| CCC | Customs Cooperation Council |
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