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).
The PMR is an anonymised version of the Unique Pupil Number (UPN). As with the original field,the PMR is unique stays with the pupil throughout their time at school. Unique Learner Number (ULN) is a 10-digit reference number issued and held by the Learner Register (LR).