Power Stone

Power Stone is Stone Man's power. When Mega Man uses it, three stones shoot out and spiral about. It takes some practice to use them efficiently, but they can be helpful to take out enemies in hard to reach (or dangerous) spots, such as the Power Muscler in the second area of Wily's Castle (near the boss, Circling Q9).

In Mega Man 2: The Power Fighters, it launches a giant stone hand that rises from the ground and goes forward.

Trivia

 * Capcom has a fighting game series called Power Stone.