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 cm blade length and bush knives of 60 cm. (HHA1.1: ABF)
For safety reasons, civilian versions were required, by Manticoran law, to emit a high pitched whine when activated. (HHA2.1: TS)
The Royal Manticoran Marine Corps used the M87 Vibro Bayonet. (JIR1)
GCA item: UT164 has the stats on making a meele weapon a vibro blade.