THANX

Set to 2 different clues across 2 published puzzles, most often "I appreciate it," in text messages — The New York Times, Saturday, 16 October 2010.

5 letters

Every clue on record, most used first

"I appreciate it," in text messagesonce
The New York Times — Saturday, 16 October 2010
Informal word of appreciationonce
The New York Times — Sunday, 27 August 1995