| AAI | American Alpine Institute (skr.) |
|---|---|
| AAI | American Alpine Institution |
| AEI | American Enterprise Institute |
| AI | Asphalt Institute |
| AIH | American Institute of Homeopathy (skr.) |
| API | American Petroleum Institut (skr.) |
| API | American Petroleum Institute (skr.) |
| DIME | Dynamics of Institutions and Markets in Europe |
| EIAR | Ethiopian Institute of Agricultural Research (skr.) |
| ELI | European Language Institute |