semiconductor unit

NOUN
18 LETTERS · STARTS WITH S

semiconductor unit is a valid 18-letter word worth 24 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1E1M3I1C3O1N1D2U1C3T1O1R1U1N1I1T1
1 + 1 + 3 + 1 + 3 + 1 + 1 + 2 + 1 + 3 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does semiconductor unit mean?