PH (disambiguation)

Look up PH, pH, or ph in Wiktionary, the free dictionary.

pH is a measure of acidity or alkalinity.

PH, ph, pH, and Ph may also refer to:

Arts and media

• PistonHeads, a motoring website and forum
• Pornhub, a pornographic website

Aviation

• PH, Aircraft registration prefix for the Netherlands
• Polynesian Airlines (IATA airline designator)
• Transavia.com Denmark (IATA airline designator)

Places

• Port Harcourt, (alternative name of the city)
• Philippines (ISO country code PH)
  • .ph, the Philippines' Internet country code top-level domain

Science and technology

Chemistry

• pH, anumerical value indicating acidity
  • Soil pH is a measure of soil acidity or soil alkalinity
• Phenyl group, either -Ph or Φ, highly-stable and aromatic hydrocarbon unit found in many organic compounds
• Pleckstrin homology domain, a part of many proteins which bind phosphoinositides with high affinity

Computing

• .ph, the Philippines' Internet country code top-level domain
• Ph protocol, an early web database search for CCSO Nameserver described by RFC 2378

Physics

• Phot, or ph, a measurement of illuminance, in photometry
• Picohenry, an SI Unit of electrical inductance

Other sciences

• PH (complexity), the union of all complexity classes in the polynomial hierarchy in computational complexity theory
• Planet Hunters, a group that hunts for exoplanets
• Precipitation hardening, a heat treatment technique used to increase the yield strength of malleable materials
• Pulmonary hypertension, a medical condition

Other uses

• pʰ, a phoneme
• Ph (digraph), a common digraph that represents the phoneme /f/ (voiceless labiodental fricative) in phonetics
• Poul Henningsen (1894–1967) Danish writer and designer referred to as PH in Denmark
• Public house, on maps
• Purple Heart, a US military award, in post-nominal designation

See also

• Phi (φ), a letter of the Greek alphabet