Phi (uppercase Φ, lowercase φ, or maths symbol ϕ) is the 21st letter of the Greek alphabet.
Phi or PHI may also refer to:
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
- 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
- Standard normal distribution, notating its cumulative distribution function and 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
- pH(I), the isoelectric point
Computing
- Xeon Phi, an Intel MIC microprocessor
- Φ (Phi) function, in static single-assignment form compiler design
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) (2007)
- 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 society at Princeton University
Other uses
- Voiceless bilabial fricative (IPA symbol: 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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