post-office box number

NOUN
22 LETTERS · STARTS WITH P

post-office box number is a valid 22-letter word worth 42 points in Scrabble and 49 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3O1S1T1-0O1F4F4I1C3E1B3O1X8N1U1M3B3E1R1
3 + 1 + 1 + 1 + 0 + 1 + 4 + 4 + 1 + 3 + 1 + 0 + 3 + 1 + 8 + 0 + 1 + 1 + 3 + 3 + 1 + 1 =42 PTS
DOUBLE WORD → 84TRIPLE WORD → 126
MEANING

What does post-office box number mean?

NOUN · 1 SENSE
1

The number of a letter box at the post office where mail is collected.