ceiling zero

12 LETTERS · STARTS WITH C

ceiling zero is a valid 12-letter word worth 23 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3E1I1L1I1N1G2Z10E1R1O1

3 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 10 + 1 + 1 + 1 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does ceiling zero mean?