Editing Phi (disambiguation)

{{wiktionary|Phi|phi}}
'''[[Phi]]''' (Φ, φ, or ϕ) is the 21st letter of the Greek alphabet.

'''Phi''' or '''PHI''' may also refer to:
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==Science and technology==
===Mathematics===
* [[Golden ratio]] (φ)
* [[Phi coefficient]], a measure of association for two binary variables introduced by Karl Pearson
* [[Euler's totient function]] or phi function
* [[Cyclotomic polynomial]] (<math>\Phi_n(x)</math>)
* [[Integrated information theory]]  (IIT) the symbol of which is φ is a mathematical theory of consciousness developed under the lead of the neuroscientist [[Giulio Tononi]]
* [[Normal distribution#Standard normal distribution|Standard normal distribution]], <math>\Phi(x)</math> notating its cumulative distribution function and <math>\phi(x)</math> its probability density function

===Physics, chemistry and biology===
* [[Phi meson]], in particle physics
* [[Magnetic flux]] (Φ)
* [[Peptide PHI]] (Peptide histidine isoleucine)
* [[6-phospho-3-hexuloisomerase]], an enzyme
* [[Phenyl group]] (Φ), a functional group in organic chemistry
* Pre-harvest interval
* [[Isoelectric point|pH(I)]], the isoelectric point

===Computing===
* [[Xeon Phi]], an Intel MIC microprocessor
* Φ (Phi) function, in [[static single-assignment form]] compiler design
* Codename for the [[Nokia Lumia 920]]

===Medicine===
* [[Permanent health insurance]], against becoming disabled
* [[Protected health information]], in US law

===Other science===
* [[Phi phenomenon]], in visual perception
* [[Krumbein phi scale]], for the size of a particle or sediment

==Arts and entertainment==
* [[Phi (KinKi Kids album)|''Phi'' (KinKi Kids album)]] (2007)
* [[Phi (Truckfighters album)|''Phi'' (Truckfighters album)]] (2007)
* [[Sailor Phi]], a villain in the ''Sailor Moon'' manga
* Phi, a character in the visual novels ''[[Zero Escape: Virtue's Last Reward]]'' and ''[[Zero Escape: Zero Time Dilemma]]''.
* ''Phi: A Voyage from the Brain to the Soul'', a book by [[Giulio Tononi]] (2012)
* Phi, a character from ''Beyblade Burst Turbo,'' a TV show written by Hiro Morita

==Organizations==
* [[Packard Humanities Institute]]
* [[Paraprofessional Healthcare Institute]], a nonprofit organization based in New York City, US
* [[Pepco Holdings Inc.]]
* [[Petroleum Helicopters International]], an American commercial helicopter operator
* [[Philadelphia]]’s major professional sports teams
** [[Philadelphia Eagles]] of the National Football League
** [[Philadelphia 76ers]] of the National Basketball Association
** [[Philadelphia Phillies]] of Major League Baseball
** [[Philadelphia Flyers]] of the National Hockey League
* [[Post-Polio Health International]]
* Phi, a [[collegiate secret societies in North America#Princeton University|collegiate secret society]] at Princeton University

==Other uses==
* [[Voiceless bilabial fricative]] (IPA symbol: {{IPA|ɸ}})
* Phi, a village in [[Sesant]], Cambodia
* Phi, [[ghosts in Thai culture]]
* [[Philippines]], IOC country code

==See also==
* [[Փ]], a letter of the Armenian alphabet
* [[PHI-base]] (Pathogen–Host Interaction database)
* ''[[Kamen Rider 555]]'' or ''Masked Rider Φ's''

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