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's design philosophy emphasizes code readability through use of 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.

Pyotr Ilyich Tchaikovsky (English: chy-KOF-skee; Russian: Пётр Ильи́ч Чайко́вский, tr. Pjotr Il'íč Čajkóvskij, IPA: [pʲɵtr ɪlʲˈjitɕ tɕɪjˈkofskʲɪj] (listen); 7 May [O.S.

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

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

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

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).

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