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

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

Pyotr Ilyich Tchaikovsky (English: chy-KOF-skee; Russian: Пётр Ильич Чайковский, tr. Pyotr Ilʹyích Chaykóvskiy, IPA: [pʲɵtr ɪlʲˈjitɕ tɕɪjˈkofskʲɪj] (listen); 7 May 1840 [O.S.

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 (c. 570 – c. 495 BC) was an Ionian Ancient Greek philosopher and the eponymous founder of Pythagoreanism.

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

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 [piɾiˈnɛws]; 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 pyramís) 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.