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.
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).
There is another variant of lower case Pi, resembling a lower case Omega: ϖ.
The upper-case letter Π is used as a symbol for:
- 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:
- 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.
|Α α Alpha||Β β Beta||Γ γ Gamma|
|Δ δ Delta||Ε ε Epsilon||Ζ ζ Zeta|
|Η η Eta||Θ θ Theta||Ι ι Iota|
|Κ κ Kappa||Λ λ Lambda||Μ μ Mu|
|Ν ν Nu||Ξ ξ Xi||Ο ο Omicron|
|Π π Pi||Ρ ρ Rho||Σ σ Sigma|
|Τ τ Tau||Υ υ Upsilon||Φ φ Phi|
|Χ χ Chi||Ψ ψ Psi||Ω ω Omega|
Medieval Greece / Byzantine Empire
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