PH (disambiguation)

pH is a measure of acidity or alkalinity.

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

Sciences

• Acidity the numerical value indicating acidity
• PH (complexity), the union of all complexity classes in the polynomial hierarchy in computational complexity theory
• Phenyl group, either -Ph or Φ, highly-stable and aromatic hydrocarbon unit found in many organic compounds
• phot, or ph, a measurement of illuminance (photometry)
• pico- henry (unit), an SI Unit of electrical inductance
• Pleckstrin homology domain, a part of many proteins which bind phosphoinositides with high affinity
• Precipitation hardening
• Pulmonary hypertension, a medical condition
• Soil pH is a measure of soil acidity or soil alkalinity

Aviation

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

Schools

• Peterhouse Boys' School, a private boys' high school in Zimbabwe.
• Peterhouse Girls' School, a private girls' high school in Zimbabwe.

Other uses

• PH, Port Harcourt, (alternative name of the city)
• PH, the Philippines' ISO country code
  • .ph, the Philippines' Internet country code top-level domain
• A post-nominal designation for recipients of the Purple Heart
• pʰ, a phoneme
• Ph (digraph), a common digraph that represents the phoneme /f/ (voiceless labiodental fricative) in phonetics
• Ph protocol, an early web database search for CCSO Nameserver described by RFC 2378
• Planet Hunters, a group that hunts for exoplanets
• Poul Henningsen (1894–1967) Danish writer and designer referred to as PH in Denmark
• PH, public house (an abbreviation used on maps)
• Ph could also refer to the pornographic site, Pornhub
• PistonHeads, a motoring website and forum

See also

• phi, the Greek letter (φ)ph