loop
1. A communications channel from a switching center or an individual message distribution point to the user terminal. Synonym subscriber line.
2. A pair of wires, or its equivalent, between a customer’s station and the central office from which the station is served. [47 CFR Pt.36-A] Synonyms local loop, user line.
3. Go-and-return conductors of an electric circuit; a closed circuit.
4. A closed path under measurement in a resistance test.
5. A type of antenna, in the form of a circle or rectangle, usually used in direction-finding equipment and in UHF reception.
6. A sequence of instructions that may be executed iteratively while a certain condition prevails until the loop has been executed once.