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 E!, a defunct Canadian television system that went by the name CH from 2001 to 2007 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• (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