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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.
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 languages , largely superseding the ISO 639-2 three-letter code standard.
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 ( ISO 639-2 ) of the standard, [ 1 ] including the corresponding two-letter ( ISO 639-1 ) codes where they exist.
Francesc Pi i Margall (1824–1901), Catalan politician; Jordi Sabater Pi (1922–2009), Catalan primatologist and ethologist; Meritxell Mateu i Pi (born 1966), Andorran diplomat; Ot Pi (born 1970), Catalan mountain bike trials rider; Pedro Pi (1899–1970), Spanish sailor; Renzo Pi Hugarte (1934–2012), Uruguayan anthropologist
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.
While the Council for German Orthography considers ä, ö, ü, ß distinct letters, [4] disagreement on how to categorize and count them has led to a dispute over the exact number of letters the German alphabet has, the number ranging between 26 (considering special letters as variants of a, o, u, s ) and 30 (counting all special letters ...
The letter q in German only ever appears in the sequence qu (/kv/), with the exception of loanwords, e.g., Coq au vin or Qigong (which is also written Chigong). The letter x (Ix, /ɪks/) occurs almost exclusively in loanwords. Native German words that are now pronounced with a /ks/ sound are usually written using chs or cks, as with Fuchs (fox).
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;