a dagger
Examples
Let us have a dagger between our teeth, a bomb in our hands, and an infinite scorn in our hearts.
Is this a dagger which I see before me The handle toward my hand.
A dagger has only a single point, but a traitor cuts from anywhere.
When a thief finds nothing to steal he will steal a dagger made of sand.
When fate throws a dagger at you, there are only two ways to catch it: by the blade or by the handle.
Use your wit as a shield, not as a dagger.