GREEK SMALL LETTER PI

About this character

Greek small letter pi (π) is the sixteenth letter of the Greek alphabet, derived from the Phoenician letter pe. Its most famous role is mathematical: the irrational constant representing the ratio of a circle’s circumference to its diameter, fundamental in geometry, trigonometry, and physics. In programming, pi appears as a predefined constant in most math libraries, used in calculations involving circles and periodic functions. In typography and design, the glyph is widely recognized, often appearing in scientific notation, engineering diagrams, and even cultural contexts like Pi Day. In statistics, lowercase pi denotes population proportions, cementing its versatility across technical disciplines.

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