Bone

Bones are items dropped by Skeletons when they are killed. Bones were added in the Minecraft Beta 1.2 update. Skeletons drop 0-2 bones on death.

Uses
Bones can currently be used to make Bone Meal, which is a fertilizer for farming that immediately makes plants grow to their mature state, and also a dye that makes wool white.

Crafting
Bone creates 3 bone meals when put in the crafting table.