Filed from 3 published puzzles

IJK

Set to 3 different clues across 3 published puzzles, most often “H-L connectors” — The New York Times, Tuesday, 21 January 1997.

3 letters

Every clue on record, most used first

H-L connectorsonce
The New York Times — Tuesday, 21 January 1997
Alphabet trioonce
The New York Times — Tuesday, 18 June 1996
Alphabet sequenceonce
The New York Times — Wednesday, 3 April 1996

Other answers to these clues

BCD3 letters
CDE3 letters
DEF3 letters
EFG3 letters
FGH3 letters
GHI3 letters
HIJ3 letters
LMN3 letters
MNO3 letters
NOP3 letters
OPQ3 letters
RST3 letters