PT, Pt, or pt may refer to:
Pterosaurs (; from the Greek πτερόσαυρος, pterosauros, meaning "winged lizard") were flying reptiles of the extinct clade or order Pterosauria.
Claudius Ptolemy (; Greek: Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos [kláwdios ptolɛmɛ́ːos]; Latin: Claudius Ptolemaeus; c.
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaurs which included some of the largest known flying reptiles, with wingspans over 6 metres (20 ft).
Ptaquiloside is a norsesquiterpene glucoside produced by bracken ferns (majorly Pteridium aquilinum) during metabolism.
The PT-76 is a Soviet amphibious light tank that was introduced in the early 1950s and soon became the standard reconnaissance tank of the Soviet Army and the other Warsaw Pact armed forces.
The PT-91 Twardy ("resilient") is a Polish main battle tank. A development of the T-72M1, it first entered service in 1995. The PT-91 was designed at the OBRUM (OBRUM for Ośrodek Badawczo-Rozwojowy Urządzeń Mechanicznych – Polish for Research and Development Centre for Mechanical Appliances) and is produced by the Bumar Łabędy company, a part of the Bumar Group, a Polish technical military consortium.