wall hanger

noun2

1. •
   A firearm that does not function or is considered unsafe to shoot, usually an older firearm that appears antique or ornate in design, hung on the wall of a room as decoration.

   • In this case, the restoration is legitimate even though the gun will be a wall hanger and never be fired. — 1982
2. •
   A caught fish suitable for display on a wall as a trophy.