Pi (letter)

Pi (upper case Π, lower case π) is the 16th letter of the Greek alphabet. In the system of Greek numerals it has a value of 80.

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In Greek, the letter is pronounced /piː/ (as in pee); in English, though, it is pronounced /paɪː/ (as the word pie). In words, it is pronounced /p/. In Modern Greek, the sequence of letters μπ represents the /b/ sound, as in boy (the second letter of the Greek alphabet is now pronounced /v/ as in very).

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There is another variant of lower case Pi, resembling a lower case Omega: ϖ.

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The upper-case letter Π is used as a symbol for:

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• The product operator in mathematics (similar to a series).
• In textual criticism, Codex Petropolitanus, a 9th century, uncial codex of the Gospels, now located in St. Petersburg, Russia.

The lower-case letter π is used as a symbol for:

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• The mathematical constant π ≈ 3.14159, the ratio of a circle's circumference to its diameter.
• The prime counting function in mathematics.
• Dimensionless parameters constructed using the Buckingham Pi theorem of dimensional analysis.
• The elementary particle called the pi meson or pion.
• Profit in microeconomics.
• Inflation rate in macroeconomics.
Pi (letter): See also ►



 

Greek alphabet: The Greek language is written in the Greek alphabet, developed in classical times (ca 9th century B.C.) and passed down to the present. It is the world's oldest alphabet in use today. In ancient Greece its letters were also used to represent numbers, called Greek numerals, analogous to Roman numeral...

Greek numerals: Greek numerals are a system of representing numbers using letters of the Greek alphabet. In modern Greece, they are still in use for ordinal numbers, and in much the same situations as Roman numerals are in the West; for ordinary numbers, Arabic numerals are used....




Pi (letter) related Images and Photos (experimental)

Letter, The (1929)	Letter, The (1940) (DVD)	Letter "Y" III	A.P.I. Cioccolato
A.P.I. Cioccolato	A.P.I. Cioccolato	Letter T	K-9 P.I. DVD (Widescreen)
pi*z*z*a	PI No. 8	Magnum P.I. - Helicopter	Magnum P.I. - Helicopter