Weapons or other tools that vibrate at extreme frequency and usually in such small movements that it's imperceptible to human eye (though often generating a distinct hum), commonly in form of swords or other bladed weapons.
Alternate names: Vibroblades, Vibrating weapons, Oscillating weapons
The first video game about Vibroweapons was released in 1995.
Occasionally the vibrating effect is somehow attributed to sound.
Most commonly these exist as swords but hammers and spears (or spikes) are somewhat common too.