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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 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.
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]
ISO 639 is a standardized nomenclature used to classify languages. [1] Each language is assigned a two-letter (set 1) and three-letter lowercase abbreviation (sets 2–5). [ 2 ] Part 1 of the standard, ISO 639-1 defines the two-letter codes, and Part 3 (2007), ISO 639-3 , defines the three-letter codes, aiming to cover all known natural ...
This list of German abbreviations includes abbreviations, acronyms and initialisms found in the German language. Because German words can be famously long, use of abbreviation is particularly common. Even the language's shortest words are often abbreviated, such as the conjunction und (and) written just as "u." This article covers standard ...
The following guidelines are intended to assist editors in Translating German Wikipedia articles for English Wikipedia.. Before starting a translation, editors should familiarise themselves with the guidance Wikipedia:WikiProject Germany/Conventions, which particularly covers the consistent and accurate naming of places, geographical features like mountains, rivers and glaciers, and man-made ...
ISO 639 is a set of international standards that lists short codes for language names. The following is a complete list of three-letter codes defined in part two of the standard, [1] including the corresponding two-letter codes where they exist.
When a musical key or key signature is referred to in a language other than English, that language may use the usual notation used in English (namely the letters A to G, along with translations of the words sharp, flat, major and minor in that language): languages which use the English system include Irish, Welsh, Hindi, Japanese (based on katakana in iroha order), Korean (based on hangul in ...