single system

13 LETTERS · STARTS WITH S

single system is a valid 13-letter word worth 18 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1I1N1G2L1E1S1Y4S1T1E1M3

1 + 1 + 1 + 2 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does single system mean?