pH is a measure of acidity or alkalinity.

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

• Philippines (ISO country code PH), a country located in Southeast Asia

Arts and media[edit]

• PistonHeads, a motoring website and forum
• PH (band), formerly known as Mr. Peter Hayden, a Finnish band
• Pornhub, a pornographic video sharing website
• Production house

Aviation[edit]

• Prefix for the Netherlands; see List of aircraft registration prefixes
• IATA airline designator for Polynesian Airlines; see List of airline codes (P)
• Transavia Denmark (IATA: PH)

Companies and organizations[edit]

• Parker-Hannifin Corporation (stock ticker PH)
• Pakatan Harapan (also known as "Alliance of Hope"), a political coalition in Malaysia

Places[edit]

• Port Harcourt, (alternative name of the city)
• Preston Hollow, Dallas, a neighborhood
• PH postcode area, postcode area in Scotland

Science and technology[edit]

Chemistry[edit]

• 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[edit]

• .ph, the Philippines' Internet country code top-level domain
• Ph protocol, an early web database search for CCSO Nameserver described by RFC 2378
• PH (complexity), the union of all complexity classes in the polynomial hierarchy in computational complexity theory

Physics[edit]

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

Other sciences[edit]

• 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[edit]

• pʰ, a phoneme
• Ph (digraph), a common digraph that represents the phoneme /f/ (voiceless labiodental fricative) in phonetics
• PH, abbreviation for professional hunter used in East and Southern Africa
• (ph), a notation used in transcripts to indicate that the transcriber does not know the spelling, usually of a name, and has spelled it as it was pronounced (phonetically)
• Poul Henningsen (1894–1967), a Danish writer and designer referred to as PH in Denmark
• Professional hunter
• Public house, most commonly referred to as pub, an establishment licensed to serve alcoholic drinks
• Purple Heart, a US military award, in post-nominal designation
• Pinch hitter, in baseball
• abbreviation used to denote the English regnal years of Philip II of Spain
• P^ḥ, abbreviation (e.g. on maps) for parish, also in the meaning of civil parish
• Phillips, a type of cross-head screw drive bits
• ⲣⲏ, Coptic for the Egyptian deity Ra

See also[edit]

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