The title of this article is conjectural. While the information presented in this article is canonical, the article subject lacks an official name, thus the title is a conjecture.

"We know Merlin put the sword there, right?.. Which means it's no ordinary sword and that's good enough for me."
Cameron Mitchell[src]

The Sword in the stone is a piece of Ancient technology left behind by the Ancient Merlin. It is a hologram of the sword which can be pulled out. This is the only known thing capable of hitting the black knight. Two such swords exist: one in the cave of Avalon under Glastonbury Tor, the other in a village on the planet Camelot. (SG1: "Avalon, Part 1", "Camelot")

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