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).
An Export Control Classification Number (ECCN) is an alpha-numeric, five character classification number used to identify items for United States export control purposes. An ECCN is different from a Schedule B number, which is used by the Bureau of Census to collect trade statistics. It is also different from the Harmonized Tariff System nomenclature, which is used to determine import duties.