PY, Py, py or P-Y may stand for:

Python is an interpreted high-level programming language for general-purpose programming. Created by Guido van Rossum and first released in 1991, Python has a design philosophy that emphasizes code readability, notably using significant whitespace.

In mathematics, the Pythagorean theorem, also known as Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle.

Pythagoras of Samos (US: , UK: ; Ancient Greek: Πυθαγόρας ὁ Σάμιος, translit. Pythagóras ho Sámios, lit.

Pyongyang, or P'yŏngyang (UK: , US: ; Korean pronunciation: [pʰjʌŋ.jaŋ]), is the capital and largest city of North Korea.

Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom.

A Pythagorean triple consists of three positive integers a, b, and c, such that a2 + b2 = c2. Such a triple is commonly written (a, b, c), and a well-known example is (3, 4, 5).

The Pyrenees (; Spanish: Pirineos [piɾiˈneos], French: Pyrénées [piʁene], Aragonese: Pirineus, Catalan: Pirineus [piɾiˈnɛus], Occitan: Pirenèus, Basque: Pirinioak [piˈɾinioˌak]) is a range of mountains in southwest Europe that forms a natural border between Spain and France.

A pyramid (from Greek: πυραμίς pyramis) is a structure whose outer surfaces are triangular and converge to a single point at the top, making the shape roughly a pyramid in the geometric sense.