identification tag

18 LETTERS · STARTS WITH I

identification tag is a valid 18-letter word worth 24 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1D2E1N1T1I1F4I1C3A1T1I1O1N1T1A1G2

1 + 2 + 1 + 1 + 1 + 1 + 4 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does identification tag mean?