logical system

NOUN
14 LETTERS · STARTS WITH L

logical system is a valid 14-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
L1O1G2I1C3A1L1S1Y4S1T1E1M3
1 + 1 + 2 + 1 + 3 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does logical system mean?