backing bar

11 LETTERS · STARTS WITH B

backing bar is a valid 11-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3A1C3K5I1N1G2B3A1R1

3 + 1 + 3 + 5 + 1 + 1 + 2 + 0 + 3 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does backing bar mean?