A written notice or poster put up in a public place, such as on a bulletin board or wall.
See also: 張り出し (はりだし)
I found a notice on the bulletin board.
Election posters are all over town.
Alternate kanji form; 張り出し can also refer to a bulletin board or overhang, but is used interchangeably with 貼り出し for posted notices.
Compound of 貼り (hari, 'pasting') + 出し (dashi, 'putting out'), from the verb 貼り出す (haridasu, 'to post a notice').