CH, Ch, cH, or ch may refer to:

Arts and entertainment

  • Television channel (sometimes abbreviated as "ch." for television and cable stations)
  • Chaos;Head, a video game
  • Clone Hero, a clone game version of popular rhythm game series Guitar Hero.
  • CollegeHumor, a comedy website
  • CH (television system), a defunct Canadian television system later known as E!

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Businesses

  • Bemidji Airlines (IATA code CH)
  • Carolina Herrera, a fashion designer based in New York
  • Columbia Helicopters, an aircraft manufacturing and operator company based in Aurora, Oregon, United States

In language

  • Ch (digraph), considered a single letter in several Latin-alphabet languages
  • Chamorro language: ISO 639 alpha-2 language code (ch)

Science and technology

Chemistry

  • The methylidyne radical (a carbyne); CH<sup>•</sup> (or •CH), CH<sup>3•</sup> (or ⫶CH)
  • The methylidyne group ≡CH
  • The methine group (methanylylidene, methylylidene) =CH−

Mathematics and computing

  • Chomsky hierarchy, in computer science, a containment hierarchy of classes of formal grammars
  • Continuum hypothesis, in set theory
  • Hyperbolic cosine, in mathematics, a hyperbolic function, ch(x) = cosh(x)
  • Curry–Howard correspondence, the relationship between computer programs and mathematical proofs
  • CH register, the high byte of an X86 16-bit CX register
  • Ch (computer programming), a cross-platform C/C++ interpreter
  • Contraction hierarchies, in computer science, a speed-up technique for finding shortest paths in a graph

Medicine<!-- ordered based on Google ngram analysis of 30 Oct 2023 -->

  • Cholesterol
  • Cluster headache
  • Congenital hypothyroidism, a condition of thyroid hormone deficiency present at birth
  • Cerebellar hypoplasia, characterized by reduced cerebellar volume
  • Cerebellar hypoplasia (non-human)
  • French catheter scale (Charrière), a scale for medical catheters, also abbreviated as Fr
  • Children's hospital

Military technology

  • Cargo helicopter (U.S. military helicopter alpha-numeric prefix)
  • Chain Home, a World War II radar array
  • Heavy cruiser (U.S. Navy ship code CH, standing for "Cruiser, Heavy")

In other sciences

  • Clay of high plasticity (USCS soil type CH)
  • Cassini-Huygens

Places

  • Confoederatio Helvetica, the formal name for Switzerland, Latin in origin
  • ISO country code for Switzerland
  • .ch, the Internet country code top-level domain for Switzerland
  • CH postcode area; the Chester postcode area in the UK
  • Chihuahua (state), the State of Chihuahua, Mexico
  • Conservation Halton, in Ontario, Canada
  • China (FIPS and NATO country code CH)
  • Chandigarh, a union territory of India
  • Chapel Hill, North Carolina

Other uses

  • Chain (length), a unit of linear measure in the Imperial system
  • Championship (dog), a dog qualifying for a championship at a conformation show, prefixed "Ch."
  • Christ's Hospital, Horsham, West Sussex
  • Companion of Honour, a British and Commonwealth honour
  • Chaudhary, an honorific used in the Indian and Pakistani Punjab regions
  • Metres above the Sea (Switzerland), an elevation reference system
  • The logo for the Montreal Canadiens ice hockey team
  • Adobe Character Animator, an Adobe software
  • Charlotte Hornets, a professional basketball team in the NBA