PT
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PT, Pt, or pt may stand for:
- Lead titanate, PbTiO_3, an abbreviation for a ferro-, pyro- and piezoelectric perovskite
- .pt, Internet country code top-level domain (ccTLD) for Portugal
- Patient, a medical abbreviation
- Peat's symbol in the Unified Soil Classification System
- Periodic table
- Perpetual traveler, Permanent Tourist, or Prior Taxpayer
- Physical therapy
- Physical training, US military term for its exercise programs
- Platinum, an atom
- Polythiophene, a molecule
- Porcupine Tree, a British progressive rock group.
- Portugal's ISO country code
- Portugal Telecom
- Portuguese language
- Prothrombin time, a measurement of blood coagulation
- PT boat, a type of small fast ship used by the US Navy in World War II
- Pulau Tiga, an island in South China Sea
- Worker's Party (Brazil) ("Partido dos Trabalhadores")