PQRS
Set to 3 different clues across 4 published puzzles, most often “OT filler” — The New York Times, Saturday, 1 March 2003.
4 letters
Every clue on record, most used first
- OT filler2 times
The New York Times — Saturday, 1 March 2003
- 7, on modern phonesonce
The New York Times — Sunday, 5 November 2006
- Alphabetic runonce
The New York Times — Friday, 29 September 1995