wigwag signal

13 LETTERS · STARTS WITH W

wigwag signal is a valid 13-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

W4I1G2W4A1G2S1I1G2N1A1L1

4 + 1 + 2 + 4 + 1 + 2 + 0 + 1 + 1 + 2 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does wigwag signal mean?