Alter Aeon Online Help

Keywords are:  'clan boards'

All clans get one free board which they can place in their area.  To get
your clan board, use the 'credit buy clanboard' command.

If you want more than one clan board, they cost 1000 credits each.

You can add multiple boards to your clan area, but only one is allowed
per room. Clan boards and clan tables cannot coexist in the same room.