periodicity factor

18 LETTERS · STARTS WITH P

periodicity factor is a valid 18-letter word worth 30 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3E1R1I1O1D2I1C3I1T1Y4F4A1C3T1O1R1

3 + 1 + 1 + 1 + 1 + 2 + 1 + 3 + 1 + 1 + 4 + 0 + 4 + 1 + 3 + 1 + 1 + 1 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does periodicity factor mean?