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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.
The word is a play on the word "pi" itself and of the linguistic field of philology. There are many ways to memorize π, including the use of piems (a portmanteau, formed by combining pi and poem), which are poems that represent π in a way such that the length of each word (in letters) represents a digit. [1]
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.
A History of Pi (book) Indiana Pi Bill; Leibniz formula for pi; Lindemann–Weierstrass theorem (Proof that π is transcendental) List of circle topics; List of formulae involving π; Liu Hui's π algorithm; Mathematical constant (sorted by continued fraction representation) Mathematical constants and functions; Method of exhaustion; Milü; Pi ...
𐌐 : Old Italic and Old Latin P, which derives from Greek Pi, and is the ancestor of modern Latin P. The Roman P had this form (𐌐) on coins and inscriptions until the reign of Claudius, c. 50 AD. 𐍀 : Gothic letter pertra/pairþa, which derives from Greek Pi; П п : Cyrillic letter Pe, which derives from Greek Pi Ⲡ ⲡ : Coptic letter Pi
This category includes articles related to the mathematical constant pi (π), which represents the ratio of a circle's circumference to its diameter. For other uses, see Pi (disambiguation) . The main article for this category is Pi .
Abbreviations: German written abbreviations are often punctuated and are pronounced as the full word when read aloud, such as beispielsweise for bspw. ("for example"). Unlike English, which is moving away from periods in abbreviations in some style guides, the placement of capital letters and periods is important in German. [1]
Pi (letter) – like most Greek letters, pi is used in conjunction with the Latin script; Pe (Cyrillic) – 'Cyrillic' cannot be a language, and so is unambiguous; Pe (Persian letter) – 'Pe (Persian)' could be about a Persian word pe; Ka (kana) – cf. Ka (Cyrillic) Zeta – the Greek letter is the WP:primary topic, as any word zeta derives ...