shelf mark

10 LETTERS · STARTS WITH S

shelf mark is a valid 10-letter word worth 21 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1H4E1L1F4M3A1R1K5

1 + 4 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 5 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does shelf mark mean?