Science Fair Project Encyclopedia
In Greek, the letter is pronounced /piː/; 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).
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.
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