(Homonym: loupe).
1. Anything with a round or oval shape that is closed or nearly closed; SYN. circuit.
2. An inner circle of advisors (especially under President Reagan).
3. The basic pattern of the human fingerprint.

ETYM Etymol. uncertain.
1. A tag.
2. A bill, as at a restaurant or bar, usually one that can be carried over from one day to the next.