Editing Pi (letter) (section)

== Variant pi ==

'''Variant pi''' or "pomega" (<math>\varpi\,\!</math> or ϖ) is a [[glyph]] variant of lowercase pi sometimes used in technical contexts. It resembles a lowercase [[omega]] with a [[Macron (diacritic)|macron]], though historically it is simply a [[cursive]] form of pi, with its legs bent inward to meet. It was also used in the [[Greek minuscule|minuscule script]]. It is a symbol for:
* [[Angular frequency]] of a [[ocean surface wave|wave]] in [[fluid dynamics]] (angular frequency is usually represented by <math>\omega</math> but this may be confused with [[vorticity]] in a fluid dynamics context).
* [[Longitude of the periapsis|Longitude of pericenter]] in [[celestial mechanics]].<ref>{{cite web |url=http://scienceworld.wolfram.com/physics/Pomega.html |title=Pomega |work=Eric Weisstein's World of Physics |publisher=wolfram.com}}</ref>
* [[Comoving distance]] in cosmology.<ref>[http://odin.physastro.mnsu.edu/~eskridge/astr225/week14.html Outline for Weeks 14&15, Astronomy 225 Spring 2008<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20100615221333/http://odin.physastro.mnsu.edu/~eskridge/astr225/week14.html |date=2010-06-15 }}</ref>
* [[Single-scattering albedo]] in [[radiative transfer]].
* [[Mean fitness]] of a population in [[biology]].
* [[Weight (representation theory)|Fundamental weights]] of a representation (probably to better distinguish from elements <math>w</math> of the Weyl group, than the usual notation <math>\omega</math>).
* The [[lemniscate constant]].<ref>{{cite journal |last1=Kobayashi |first1=Hiroyuki |last2=Takeuchi |first2=Shingo |title=Applications of generalized trigonometric functions with two parameters |journal=Communications on Pure & Applied Analysis |date=2019 |volume=18 |issue=3 |pages=1509 |doi=10.3934/cpaa.2019072|arxiv=1903.07407|s2cid=102487670 }}</ref>