Bulletin board fasteners are items used to attach notices, memos, and other documents to a bulletin board. Common fasteners include tacks (4 letters), pushpins (7 letters), thumbtacks (9 letters), TACK pins (7 letters), sysop (5 letters), repost (6 letters), posts (5 letters), and MEMO (4 letters). These items are used to securely attach documents to a bulletin board so that they can be easily seen and accessed by others.