coupling pin

12 LETTERS · STARTS WITH C

coupling pin is a valid 12-letter word worth 18 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3O1U1P3L1I1N1G2P3I1N1

3 + 1 + 1 + 3 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does coupling pin mean?