Phi (disambiguation)

Phi (Φ, φ, or ϕ) is the 21st letter of the Greek alphabet.

Phi or PHI may also refer to:

Science and technology

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 ( $\Phi _{n}(x)$ )
Integrated information theory (IIT) the symbol of which is φ
Standard normal distribution, $\Phi (x)$ notating its cumulative distribution function and $\phi (x)$ its probability density function

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

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
Phi, a collegiate secret society at Princeton University
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
Prince Henry's Institute of Medical Research, a former research institute in Melbourne, Australia