Silver Arrow

The Silver Arrow is a special arrow upgrade used to defeat Ganon.

The Legend of Zelda
In Legend of Zelda, the Silver Arrows are found in Level 9, the final dungeon. After hitting Ganon with his sword, Link used the Silver Arrow to finish him off. Besides being able to finish off Ganon, these arrows work excactly the same against every thing else.

A Link to the Past
In A Link to the Past, the Silver Arrows are the most powerful arrows, given to Link by the Fat Fairy inside the Pyramid of Power. They are again used to kill Ganon, or the more technical term, "Give Ganon his last". Used as weapons in the field, they can kill most enemies in a single shot, including some bosses.

The Ancient Stone Tablets
In The Ancient Stone Tablets, the Silver Arrows appear from a giant stone slab, that sealed away Ganon's Tower from the world.