What is whetstone is used for Macbeth?

In "Macbeth," the whetstone is symbolically used to represent the sharpening of Macbeth's ambition and desire for power. It is also a metaphor for how Lady Macbeth spurs him on to commit murder by goading him to "prove his manhood" through violence. Overall, the whetstone is a powerful image that highlights the characters' descent into darkness and moral corruption.