CH

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!

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)

Chemistry

 * The methylidyne radical (a carbyne); CH• (or •CH), CH3• (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

 * 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