cartesian coordinates

21 LETTERS · STARTS WITH C

cartesian coordinates is a valid 21-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3A1R1T1E1S1I1A1N1C3O1O1R1D2I1N1A1T1E1S1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does cartesian coordinates mean?