MMD
Set to 2 different clues across 2 published puzzles, most often “Mid-millennium year” — The New York Times, Sunday, 1 January 2006.
3 letters
Every clue on record, most used first
- Mid-millennium yearonce
The New York Times — Sunday, 1 January 2006
- Roman square?once
The New York Times — Saturday, 11 September 2004