scale bug

9 LETTERS · STARTS WITH S

scale bug is a valid 9-letter word worth 13 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1C3A1L1E1B3U1G2

1 + 3 + 1 + 1 + 1 + 0 + 3 + 1 + 2 =13 PTS

DOUBLE WORD → 26TRIPLE WORD → 39

MEANING

What does scale bug mean?