Confederatio Helvetica, the formal Latin name for Switzerland

People's Republic of China (FIPS and NATO country code CH)

Continuum hypothesis, in set theory

Christ's Hospital School, Horsham, West Sussex.

ISO country code for Switzerland

Cluster headache

Cutie Honey, an anime series

In mathematics, a hyperbolic function, ch(x) = cosh(x)

Chain Home Radar

Clay of high plasticity (USCS soil type CH)

Ch (digraph), considered a single letter in several Latin-alphabet languages

Congenital hypothyroidism

Heavy cruiser (U.S. navy ship code CH, standing for "Cruiser, Heavy")

Chamorro language: ISO 639 alpha-2 language code (ch)

Order of the Companions of Honour, a British and Commonwealth honour.

Channel (sometimes abbreviated as "ch." for television and cable stations)

Ch interpreter, an interpreted superset of the C programming language

Conservation Halton, in Ontario, Canada

Bemidji Airlines IATA code

CH, a Canadian television system now known as E!

Cargo helicopter (U.S. military helicopter alpha-numeric prefix)

.ch, the Internet country code top-level domain (ccTLD) for Switzerland

Carolina Herrera, a fashion designer based in New York.