tail unit

9 LETTERS · STARTS WITH T

tail unit is a valid 9-letter word worth 8 points in Scrabble and 11 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1A1I1L1U1N1I1T1

1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 =8 PTS

DOUBLE WORD → 16TRIPLE WORD → 24

MEANING

What does tail unit mean?