Underwriters Laboratories is the most widely accepted standard for the construction of and testing of safes. The criteria for testing actual safes comes from the UL-687 standard. If we go by that standard, virtually every "safe" any of us have in our homes does not qualify as a safe. Of all the "safes" out there that most of own and that have been UL tested, they are tested to the UL-1037 standard for residential security container (RSC), which is a lower standard. That is where some of the differing terminology (safe, cabinet, container etc.) comes from I think.