ECH
Set to 2 different clues across 4 published puzzles, most often “Command level: Abbr.” — The New York Times, Friday, 17 January 2003.
3 letters
Every clue on record, most used first
- Command level: Abbr.3 times
The New York Times — Friday, 17 January 2003
- Level of hierarchy: Abbr.once
The New York Times — Saturday, 1 February 1997