The Double-Bladed Dagger is a weapon from Ninjago, associated with the Ninja. It is a silver dagger with large, triangular spike-like blades on both ends, described as being a useful weapon for inexperienced fighters to use. There is a single-sided version of this, known as the Silver Nick Dagger.
In LEGO Universe, a weapon known as the "Imagination Spinjitzu Double-Bladed Dagger" appears. It is identical to the Double-Bladed Dagger, but it allows the user to perform "Imagination Spinjitzu," a unique Spinjitzu that appears to be a mixture of Ice and Lightning.
Twice the fun of a regular dagger, this handy weapon can attack danger from either side. It’s a great weapon for the new hero.