A vibro blade was a type of powered tool or edged weapon used in the Post Diaspora era.
The cutting edge of a vibro knife was less than a molecule wide and could inflict terrible wounds when active. It existed in several versions, including small survival knives of 18 centimeter blade length and bush knives of 60 centimeter. (HHA1.1: ABF)
During the reign of the Legislaturalist's on Haven, vibro blades were ignored by the police so long as they had a maximum blade length of 30 centimeters. Blades used by factions such as the April Tribunal had a length of 1-2 meters and were silent. (Recruiting Exercise)