Deceleration Device

Deceleration device: In fall protection, any mechanism, such as a rope grab, rip-stitch lanyard, specially woven lanyard, tearing or deforming lanyard, automatic self-retracting lifeline/lanyard, etc., which serves to dissipate a substantial amount of energy during a fall arrest, or otherwise limit the energy imposed on an employee during fall arrest. SOURCE: OSHA

Used in Fall Protection a Deceleration Device can reduce the acceleration rate of a person who falls.