Broken Sword

The broken sword appears in several Zelda games.

Ocarina of Time
Also known as the "Broken Giant's Knife", the broken sword is the handle and portion of the blade remaining from the Giant's Knife. The remaining handle can still be used as a weapon, but will only inflict 1/4 the damage of the original Giant's Knife. If Link returns the broken sword to Medigoron, he will forge a new one for 200 rupees.

If Link completes the trading sidequest; he can get the sturdier Biggoron Sword, which will not break.

Oracle of Ages
The Broken Sword is the last trading sequence item, and becomes the Noble Sword when Link goes with Patch to repair it at the Restoration Wall. Link gets it from the Old Zora in a cave near Rafton's House, in exchange for the Sea Ukulele.

The Minish Cap
Not so much referred to as the "broken sword", Link receives the broken handle of the Picori Blade early in the game, which Melari will reforge for later in the game.