CH

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

Arts and entertainment

• CollegeHumor, a comedy website
• CH (television system), a defunct Canadian television system later known as E!

Businesses

• Bemidji Airlines (IATA code CH)
• A product line by Carolina Herrera (fashion designer)

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^• (or •CH), CH^3• (or ⫶CH)
• The methylidyne group ≡CH
• The methine group (methanylylidene, methylylidene) =CH−

Mathematics and computing

• Continuum hypothesis, in set theory
• 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

• Congenital hypothyroidism, a condition of thyroid hormone deficiency present at birth
• French catheter scale (Charrière), a scale for medical catheters, also abbreviated as Fr
• Children's hospital

Military technology

• Chain Home, a World War II radar array

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
• 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