Wedge 3 : A tapered plastic, steel, or aluminium alloy tool which is driven into a back cut by a hammer to prevent the tree from sitting back on the back cut, or to force it towards the desired direction of fall
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}