This article is from the ER FAQ, by Rose Cooper email@example.com with numerous contributions by others.
"ER" takes place in Cook County General Hospital, and is based
on Cook County Hospital, a real hospital in Chicago. The hospital is
sometimes referred to, on the show and in real life, as "CCH".
[Note: this is not to be confused with the actress who plays Dr. Hicks,
who is also known in real life as CCH [Pounder]. See alt.tv.er for
theoretical enunciation. See section 5.38 for actual answer.]