- Afghan Islamic Press , a News Agency based in Pakistan .
- Air-independent Propulsion , Submarine propulsion systems which do not require it to surface frequently.
- American Institute Of Parliamentarians , an educational organization promoting the advancement of parliamentary procedure.
- American Institute Of Physics , a professional body for American Physicists .
- American Institute Of Philanthropy , an American nonprofit charity watchdog and information service.
- American International Pictures , an American Movie company.
- Australian Institute Of Petroleum , an Australian trade organisation.
- Australian Institute Of Physics , a professional body for Australian physicists.
- Aeronautical Information Publication
- Acute Intermittent Porphyria , a medical condition.
- Archive International Productions , a music label. {Link without Title}
- Agent Interaction Protocol , a protocol for interactions between agents in a multi-agent system.
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