Strappado bondage is a term describing a position and technique used in BDSM play. A person's arms are bound behind their back, then by use of some method of attachment such as a rope or chain that runs from their wrists to a securing point above, their arms are lifted up behind them until the person is forced to bend forward.
http://www.londonfetishscene.com/wipi/index.php/Strappado