CH, Ch, cH, or ch may refer to:
Arts and entertainment
*
Television channel (sometimes abbreviated as "ch." for television and cable stations)
* ''
Chaos;Head
''Chaos;Head'' (stylized as ''ChäoS;HEAd'') is a 2008 science fiction visual novel video game developed by 5pb. and Nitroplus. It is the first game in the ''Science Adventure'' series. An enhanced version titled ''Chaos;Head Noah'' was releas ...
'', a video game
* ''
Clone Hero'', a clone game version of popular rhythm game series ''
Guitar Hero
''Guitar Hero'' is a series of rhythm games first released in 2005, in which players use a guitar-shaped game controller to simulate playing primarily lead guitar, lead, bass guitar, bass, and rhythm guitar across numerous songs. Players match ...
''.
*
CollegeHumor
Dropout, incorporated as CH Media and formerly known as CollegeHumor, is an Internet comedy company based in Los Angeles that produces content for release on its streaming service Dropout (streaming platform), Dropout as well as YouTube. Dropou ...
, a comedy website
*
CH (television system), a defunct Canadian television system later known as E!
Businesses
*
Bemidji Airlines (IATA code CH)
*
Carolina Herrera
Carolina Herrera (born María Carolina Josefina Pacanins y Niño, 8 January 1939) is a Venezuelan Americans, Venezuelan American fashion designer. Known for her personal style, she founded her namesake brand in 1980. Herrera has designed for va ...
, 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)
Ch is a digraph in the Latin script. It is treated as a letter of its own in the Chamorro, Old Spanish, Czech, Slovak, Igbo, Uzbek, Quechua, Ladino, Guarani, Welsh, Cornish, Breton, Ukrainian Latynka, and Belarusian Łacinka alph ...
, considered a single letter in several Latin-alphabet languages
*
Chamorro language
Chamorro (, ; orthern Mariana Islandsor uam) is an Austronesian languages, Austronesian language spoken by about 58,000 people, numbering about 25,800 on Guam and about 32,200 in the Northern Mariana Islands and elsewhere.
It is the h ...
: ISO 639 alpha-2 language code (ch)
Science and technology
Chemistry
* The
methylidyne radical
Methylidyne, or (unsubstituted) carbyne, is an organic compound whose molecule consists of a single hydrogen atom bonded to a carbon atom. It is the parent compound of the carbynes, which can be seen as obtained from it by substitution of other ...
(a carbyne); CH
• (or •CH), CH
3• (or ⫶CH)
* The
methylidyne group ≡CH
* The
methine group (methanylylidene, methylylidene) =CH−
Mathematics and computing
*
Chomsky hierarchy
The Chomsky hierarchy in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a formal language's alphabet that are v ...
, in computer science, a containment hierarchy of classes of formal grammars
*
Continuum hypothesis
In mathematics, specifically set theory, the continuum hypothesis (abbreviated CH) is a hypothesis about the possible sizes of infinite sets. It states:
Or equivalently:
In Zermelo–Fraenkel set theory with the axiom of choice (ZFC), this ...
, in set theory
*
Hyperbolic cosine
In mathematics, hyperbolic functions are analogues of the ordinary trigonometric functions, but defined using the hyperbola rather than the circle. Just as the points form a circle with a unit radius, the points form the right half of the un ...
, in mathematics, a hyperbolic function, ch(x) = cosh(x)
*
Curry–Howard correspondence
In programming language theory and proof theory, the Curry–Howard correspondence is the direct relationship between computer programs and mathematical proofs. It is also known as the Curry–Howard isomorphism or equivalence, or the proofs-as-p ...
, the relationship between computer programs and mathematical proofs
*
CH register, the high byte of an X86 16-bit CX register
*
Ch (computer programming)
CH is a proprietary cross-platform C and C++ interpreter and scripting language environment. It was designed by Harry Cheng as a scripting language for beginners to learn mathematics, computing, numerical analysis (numeric methods), and progra ...
, a cross-platform C/C++ interpreter
*
Contraction hierarchies
In computer science, the method of contraction hierarchies is a speed-up technique for finding the shortest path in a graph. The most intuitive applications are car-navigation systems: a user wants to drive from A to B using the quickest possible ...
, in computer science, a speed-up technique for finding shortest paths in a graph
Medicine
*
Cholesterol
Cholesterol is the principal sterol of all higher animals, distributed in body Tissue (biology), tissues, especially the brain and spinal cord, and in Animal fat, animal fats and oils.
Cholesterol is biosynthesis, biosynthesized by all anima ...
*
Cluster headache
Cluster headache is a neurological disorder characterized by recurrent severe headaches on one side of the head, typically around the eye, eye(s). There is often accompanying eye watering, nasal congestion, or swelling around the eye on the aff ...
*
Congenital hypothyroidism
Congenital hypothyroidism (CH) is thyroid hormone deficiency present at birth. If untreated for several months after birth, severe congenital hypothyroidism can lead to growth failure and permanent intellectual disability. Infants born with co ...
, a condition of thyroid hormone deficiency present at birth
*
Cerebellar hypoplasia
Cerebellar hypoplasia is characterized by reduced cerebellar volume, even though cerebellar shape is (near) normal. It consists of a heterogeneous group of disorders of cerebellum, cerebellar maldevelopment presenting as early-onset Non-progress ...
, characterized by reduced cerebellar volume
*
Cerebellar hypoplasia (non-human)
Cerebellar hypoplasia is a neurological condition in which the cerebellum is smaller than usual or not completely developed. It has been reported in many animal species.
Function and development of the cerebellum
The cerebellum is the brain' ...
*
French catheter scale
The French scale, also known as the French gauge or Charrière system, is a widely used measurement system for the size of catheters. It is commonly abbreviated as Fr but may also be abbreviated as Fg, FR or F, and less frequently as CH or Ch (re ...
(Charrière), a scale for medical catheters, also abbreviated as ''Fr''
*
Children's hospital
A children's hospital (CH) is a hospital that offers its services exclusively to infants, children, adolescents, and young adults from birth up to until age 18, and through age 21 and older in the United States. In certain special cases, the ...
Military technology
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Cargo helicopter
A helicopter is a type of rotorcraft in which Lift (force), lift and thrust are supplied by horizontally spinning Helicopter rotor, rotors. This allows the helicopter to VTOL, take off and land vertically, to hover (helicopter), hover, and ...
(U.S. military helicopter alpha-numeric prefix)
*
Chain Home
Chain Home, or CH for short, was the codename for the ring of coastal early warning radar stations built by the Royal Air Force (RAF) before and during the Second World War to detect and track aircraft. Initially known as RDF, and given the off ...
, a World War II radar array
*
Heavy cruiser
A heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treat ...
(U.S. Navy ship code CH, standing for "Cruiser, Heavy")
In other sciences
*
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impuriti ...
of high plasticity (USCS soil type CH)
*
Cassini-Huygens
Places
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Confoederatio Helvetica
Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...
, the formal name for Switzerland, Latin in origin
**
ISO country code
ISO 3166 is a standard published by the International Organization for Standardization (ISO) that defines codes for the names of countries, dependent territories, special areas of geographical interest, and their principal subdivisions (e.g., pro ...
for Switzerland
**
.ch, the Internet country code top-level domain for Switzerland
*
CH postcode area
The CH postcode area, also known as the Chester postcode area, is a group of 37 postcode districts in North West England and North East Wales. Together the districts cover west Cheshire, the Wirral part of Merseyside, and east Flintshire. Its t ...
; the Chester postcode area in the UK
*
Chihuahua (state)
Chihuahua, officially the Free and Sovereign State of Chihuahua, is one of the 31 states which, along with Mexico City, comprise the Political divisions of Mexico, 32 federal entities of Mexico. It is located in the northwestern part of Mexico a ...
, the State of Chihuahua, Mexico
*
Conservation Halton, in Ontario, Canada
*
China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
(FIPS and NATO country code CH)
*
Chandigarh
Chandigarh is a city and union territory in northern India, serving as the shared capital of the states of Punjab and Haryana. Situated near the foothills of the Shivalik range of Himalayas, it borders Haryana to the east and Punjab in the ...
, a union territory of India
*
Chapel Hill, North Carolina
Chapel Hill is a town in Orange County, North Carolina, Orange and Durham County, North Carolina, Durham counties, North Carolina, United States. Its population was 61,960 in the 2020 United States census, making Chapel Hill the List of municipa ...
Other uses
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Chain (length)
The chain (abbreviated ch) is a unit of length equal to 66 feet (22 yards), used in both the US customary and Imperial unit systems. It is subdivided into 100 links. (PDF) There are 10 chains in a furlong, and 80 chains in one statute mile. ...
, a unit of linear measure in the Imperial system
*
Championship (dog)
Championships are awarded to dogs who have passed through a process of selection at dog shows. Traditionally, a championship was received at a conformation show, but championships are now offered for dogs who have attained a high degree of perfec ...
, a dog qualifying for a championship at a conformation show, prefixed "Ch."
*
Christ's Hospital
Christ's Hospital is a Public school (United Kingdom), public school (English Private schools in the United Kingdom, fee-charging boarding school for pupils aged 11–18) with a royal charter, located to the south of Horsham in West Sussex.
T ...
, Horsham, West Sussex
*
Companion of Honour
The Order of the Companions of Honour is an order of the Commonwealth realms. It was founded on 4 June 1917 by King George V as a reward for outstanding achievements. It was founded on the same date as the Order of the British Empire.
The ord ...
, a British and Commonwealth honour
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Chaudhary
Chowdhury (also: Choudhuri, Chaudhuri, Choudhury, Chaudhri, Chaudhary) is a title of honour, usually hereditary, originating from the Indian subcontinent. It is an adaption from Sanskrit. During the Mughal rule, it was a title awarded to eminen ...
, an honorific used in the Indian and Pakistani Punjab regions
*
Metres above the Sea (Switzerland)
Metres above the Sea (German: ''Meter über Meer (m ü. M.)'') is the vertical datum used in Switzerland. Both the system and the term are also used in the Principality of Liechtenstein.
Use
In Switzerland, levelled heights from the ...
, an elevation reference system
* The logo for the
Montreal Canadiens
The Montreal Canadiens (), officially ' ( Canadian Hockey Club) and colloquially known as the Habs, are a professional ice hockey team based in Montreal. The Canadiens compete in the National Hockey League (NHL) as a member of the Atlantic D ...
ice hockey team
*
Adobe Character Animator
Adobe Character Animator is a desktop application software product that combines real-time live motion-capture with a multi-track recording system to control layered 2D puppets based on an illustration drawn in Photoshop or Illustrator. It is au ...
, an Adobe software
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