LAMBDA means “Lingual archwire production and design aid” is often a method for exact and rapid bending of orthodontic archwires. This technique understands motion only in X-Y airplane, so a closed loop can't be bent with the assistance of This method (Figure four) According to the American Affiliation of Orthodontists https://bookmarkfavors.com/story4450942/rectangular-steel-wire-fundamentals-explained