control indicator

17 LETTERS · STARTS WITH C

control indicator is a valid 17-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3O1N1T1R1O1L1I1N1D2I1C3A1T1O1R1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 3 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does control indicator mean?