Crossword Clue:

QUATERNARY a set of four

AnswerCrossword Clue
RACKOne of four in a Scrabble set
TYREOne of a set of four on a London taxi
QUARTILEStatistical dividing point in a four-group data set
SATCHMO1957 four-LP jazz set subtitled "A Musical Autobiography"
QUATERNIONSet of four.
QUATERNARYSet of four