π

Symbol

 * 1)  Pi, an irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.14159265.
 * 2)  pion, pi meson
 * 3)  A voiceless labiodental plosive (p̪).
 * 1)  A voiceless labiodental plosive (p̪).
 * 1)  A voiceless labiodental plosive (p̪).

Etymology
Derived from its majuscule counterpart Π.

Letter

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

Derived terms
See also pi

Letter

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