stop number

NOUN
11 LETTERS · STARTS WITH S

stop number is a valid 11-letter word worth 16 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1T1O1P3N1U1M3B3E1R1
1 + 1 + 1 + 3 + 0 + 1 + 1 + 3 + 3 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does stop number mean?

NOUN · 1 SENSE
1

The ratio of the focal length to the diameter of a (camera) lens system.

BROADER