Ascender : Mechanical device (clamps) utilized by high angle rescue teams, that allows the flow of rope to be controlled in a specific direction (usually upward)
United States Search and Rescue Task Force, Search & Rescue and Disaster Glossary and Acronyms, Pennsylvania, USA 2014. http://www.ussartf.org/glossary_acronyms.htm, (Dzstr/SAR - Amer) {803}