back projection

15 LETTERS · STARTS WITH B

back projection is a valid 15-letter word worth 33 points in Scrabble and 40 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3A1C3K5P3R1O1J8E1C3T1I1O1N1

3 + 1 + 3 + 5 + 0 + 3 + 1 + 1 + 8 + 1 + 3 + 1 + 1 + 1 + 1 =33 PTS

DOUBLE WORD → 66TRIPLE WORD → 99

MEANING

What does back projection mean?