CSH

CSH is a three-letter abbreviation with multiple meanings:

The United States Army operates combat support hospitals. In this case, "CSH" is pronounced like "cash," reflecting the hospitals' descendancy from MASH units.
csh is a Unix shell, a program that provides a text-based command line for directing the operations of computers.
Computer Science House is a special interest house at Rochester Institute of Technology.
Council for Secular Humanism
Canadian Subject Headings is a list of subject headings in the English language, using controlled vocabulary, to access and express the subject content of documents on Canada and Canadian topics.