The doctrine is not a defined law that can be invoked, but a set of principles which is incorporated in some form in the law of many states. The legal concept of the inviolability of the home has been known in Western Civilization since the age of the Roman Republic.
1 Operating Company Number, in telephony, a code used in various iconectiv telephony products, a major subset of which equate to Company Codes assigned by the National Exchange Carrier Association (NECA) to telecommunications carriers (including landline, wireless carriers, and resellers of various types).
Reg. A Uniform Registry Number (URN) is a registration number for manufacturers whose products will be sold in the U.S. URNs allow uniformity of registration numbers throughout the U.S. and can be used in all required states, but they must be registered in each individual state to be recognized.