Pi (letter)

sixteenth letter of the Greek alphabet

Pi (uppercase/lowercase Π π), is the letter of the Greek alphabet, used to represent the "p" sound in Ancient and Modern Greek. In the system of Greek numerals, it had a value of 80. Letters that came from it include the Roman P and Cyrillic П.

In mathematics, the uppercase pi is used for the Pi product operator (for example. ),[1] similar to the way summation is used. The lowercase pi is used as the mathematical constant pi, also known as Archimedes's constant.[2]

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  1. "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-09-22.
  2. "Pi Symbol in Greek Alphabet". www.greeksymbols.net. Retrieved 2020-09-22.