Magical Sword
In The Legend of Zelda, the Magical Sword is the most powerful of the three swords Link can use. It is more powerful than the Wooden Sword or the White Sword. It is found under a grave in the cemetery. It is assumed that this is the sword wielded in Zelda II: The Adventure of Link as well.
There is a some debate as to whether or not the Magic Sword is in truth the Master Sword[1]. Although in the The Legend of Zelda: Twilight Princess a similar looking sword is wielded by the Hero's Spirit, while Link has the Master Sword.