B1
a board on the wall where you put advertisements and announcements
Dictionary examples:
The bulletin board was so full, it looked like a paper monster! (0.0)
Our bulletin board is so old, it's advertising a sale from 1999! (0.0)
I put a 'Need Sleep' ad on the bulletin board. My roommate wasn't amused. (0.0)
The class schedule is up on the bulletin board. (51.2)