Εννοια

1. a ring (a circular and hollow object, made of any material.)
2. a ring (small jewelry worn on the finger (usually composed of precious metals))
3. a ring (a group of people, often involved into criminal and illegal actions)
4. a ring (algebraic structure)
5. a ring (planar geometrical figure)
6. an annulet (ring used as a charge)
7. a ring (a collection of material orbiting a planet)
8. a ring (a place where events such as wrestling and boxing take place)
9. a street that encircles a city where once the old town walls have been; a boulevard.