1. A wall made of stone.
2. A not commonly known videogame character archetype that sacrifices offensive power for more defenses. In co-op based games, this character archetype will usually be the tank if not the mighty glacier directing hits and tanking them. Their damage output doesn't always have to be subpar but it could be limited by other factors such as range or mobility. (In short, he can't kill you but you can't kill him)
Example one:
Person 1: "Oh wow a stone wall!"
Person 2: "Yep It's made of stone"
Example Two
Person 1: *Throwing all of his attacks to kill the stone wall*
Stone Wall: "HAHA you'll never kill me I'm invincible !"
Person 1: "Well yes, but you don't have anything to fight back"
Stone Wall: "Oh"