Acronyms
- PAI Partners, a French private equity firm
- Parachute Association of Ireland, a representative/regulatory body for skydivers in Ireland
- Parti Africain de l’Indépendance, the French name for the African Independence Party
- Partner Aid International, a German-based Christian humanitarian organization
- Pathogenicity island, a distinct class of genomic island which is acquired by horizontal transfer
- Personality Assessment Inventory, a test given by psychologists
- Photoacoustic Imaging
- Plasminogen activator inhibitor-1
- Plasminogen activator inhibitor-2
- Plasminogen activator inhibitor-1 (PAI-1) and Plasminogen activator inhibitor-2, two proteins that inhibit fibrinolysis (breakdown of blood clots)
- Poalei Agudat Yisrael, ultra-Orthodox Israeli political party
- Polizia dell'Africa Italiana or the Italian Africa Police
- Polyamide-imide, a thermoplastic polymer
- Polyatomic Ion
- Population Action International
- Pre-Approval Inspection, a type of inspection performed by the US FDA of a manufacturing establishment
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