PT, Pt, or pt may refer to:
Pterosaurs (; from Greek, meaning "winged lizard") were flying reptiles of the extinct clade or order Pterosauria.
Claudius Ptolemy (; Koinē Greek: Κλαύδιος Πτολεμαῖος, Klaúdios Ptolemaîos [kláwdios ptolɛmɛ́os]; Latin: Claudius Ptolemaeus; c.
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaur that included some of the largest known flying reptiles, with wingspans over 7 meters (23 feet).
Pteropus (suborder Yinpterochiroptera) is a genus of megabats which are among the largest in the world.
The PT-91 Twardy ("Hard") 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.
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.