string proof

12 LETTERS · STARTS WITH S

string proof is a valid 12-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1T1R1I1N1G2P3R1O1O1F4

1 + 1 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 4 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does string proof mean?