CCU

Set to 2 different clues across 2 published puzzles, most often “Heart ward, for short” — The New York Times, Sunday, 21 September 1997.

3 letters

Every clue on record, most used first

Heart ward, for shortonce
The New York Times — Sunday, 21 September 1997
Hosp. sect. for cardiac casesonce
The New York Times — Saturday, 5 February 1994