The armoring industry uses several standards for measuring and classifying armoring materials. Published standards include Underwriters Laboratories [ U.L. ] 752 Ballistic Test Standards, National Institute of Justice [NIJ] 018.01 Ballistic Test Standards, and European Standard EN 1063. Table 1 is reference list with a hierarchy of increasingly bullet-resistant materials for the three standards. As an example standard, NIJ publishes Ballistic Resistance of Body Armor NIJ Standard-0101.06,