See also: Π [U+03A0 GREEK CAPITAL LETTER PI], [U+220F N-ARY PRODUCT], [U+3107 BOPOMOFO LETTER M], [U+312B BOPOMOFO LETTER NG], [U+4E0C CJK UNIFIED IDEOGRAPH-4E0C], [U+5140 CJK UNIFIED IDEOGRAPH-5140], [U+3160 HANGUL LETTER YU], and Appendix:Variations of "p"

π U+03C0, π
GREEK SMALL LETTER PI
ο
[U+03BF]
Greek and Coptic ρ
[U+03C1]

Translingual

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This mosaic is outside the mathematics building at the Technische Universität Berlin.
 
When a circle's diameter is 1 unit, its circumference is π units.
 
When a circle's radius is 1 unit, its circumference is 2π units.

Symbol

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π

  1. (mathematics) Pi, an irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.14159265.
  2. (particle physics) pion, pi meson
  3. (mathematics) homotopy group
  4. (mathematics) prime-counting function
  5. (UPA) A voiced labial click consonant (IPA [ɡ͜ʘ]).
  6. (phonetics, rare) A voiceless labiodental plosive ().

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Ancient Greek

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Etymology

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Derived from its majuscule counterpart Π.

Letter

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π (p) (lowercase, uppercase Π)

  1. Lower-case pi (πεῖ), the 16th letter of the ancient Greek alphabet. It represented the voiceless unaspirated bilabial plosive /p/. It is preceded by ο and followed by ρ.

Derived terms

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See also pi

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Greek

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Letter

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π (p) (lowercase, uppercase Π)

  1. The lower case letter pi (πι), the 16th letter of the modern Greek alphabet.

See also

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