visibility zero

15 LETTERS · STARTS WITH V

visibility zero is a valid 15-letter word worth 31 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

V4I1S1I1B3I1L1I1T1Y4Z10E1R1O1

4 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 + 0 + 10 + 1 + 1 + 1 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does visibility zero mean?