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.
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaur which included some of the largest known flying reptiles, with wingspans over 6 metres (20 ft).
Claudius Ptolemy (; Greek: Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos [kláwdios ptolɛmɛ́ːos]; Latin: Claudius Ptolemaeus; c.
Bats of the genus Pteropus (suborder Yinpterochiroptera) are among the largest bats in the world. They are commonly known as fruit bats or flying foxes, among other colloquial names.
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.