Phi (disambiguation)

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

Phi or PHI may also refer to:

Mathematics

• Golden ratio or φ
• Phi coefficient, a measure of association for two binary variables introduced by Karl Pearson
• Euler's totient function or phi function
• Φ (Phi) function, a function in static single assignment form

Medicine and health

• Paraprofessional Healthcare Institute, a nonprofit organization based in New York City
• Permanent health insurance, income replacement for employees who are unable to work due to disability
• Post-Polio Health International
• Protected health information

Science

• Phi meson
• Phi phenomenon in visual perception
• Krumbein phi scale for the size of a particle or sediment
• Magnetic flux or Φ
• Peptide PHI or Peptide histidine isoleucine
• 6-phospho-3-hexuloisomerase or PHI, an enzyme
• PHI-base or Pathogen-Host Interaction database

Sport

• Philadelphia 76ers, a National Basketball Association team
• Philadelphia Eagles, a National Football League team
• Philadelphia Flyers, a National Hockey League team
• Philadelphia Phillies, a Major League Baseball team

Other uses

• Phi (KinKi Kids album) (2007)
• Phi (Truckfighters album) (2007)
• Packard Humanities Institute
• Pepco Holdings Inc.
• Kamen Rider 555 or Masked Rider Φ's
• Sailor Phi, a villain in the Sailor Moon manga
• ɸ, the IPA symbol for voiceless bilabial fricative
• Phi, a village in Sesant, Cambodia
• Phi, a secret society at Princeton University
• Phi, a character in the visual novel Zero Escape: Virtue's Last Reward
• Phi, ghosts in Thai culture
• Xeon Phi, an Intel MIC microprocessor

See also

• Փ, a letter of the Armenian alphabet