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Pi (/ˈpaɪ/; Ancient Greek /piː/ or /peî/, uppercase Π, lowercase π, cursive ϖ; Greek: πι) is the sixteenth letter of the Greek alphabet, representing the voiceless bilabial plosive IPA:. In the system of Greek numerals it has a value of 80.
Use this template to properly display the lower-case Greek letter pi as a mathematical symbol: π. Notes Do not use {{ pi }} within the {{ math }} template; use π instead.
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A book cover is any protective covering used to bind together the pages of a book. Beyond the familiar distinction between hardcovers and paperbacks , there are further alternatives and additions, such as dust jackets , ring-binding, and older forms such as the nineteenth-century "paper-boards" and the traditional types of hand-binding .
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The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.