significant digit

NOUN
17 LETTERS · STARTS WITH S

significant digit is a valid 17-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1I1G2N1I1F4I1C3A1N1T1D2I1G2I1T1
1 + 1 + 2 + 1 + 1 + 4 + 1 + 3 + 1 + 1 + 1 + 0 + 2 + 1 + 2 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does significant digit mean?

NOUN · 1 SENSE
1

Any digit of a number that is known with certainty; any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value).