A ring is usually anything resembling a circle, or a noise that cycles rapidly. See:

Different types of rings

• ring in ring theory of mathematics
• the ring of a telephone or bell
• a ring diacritic mark as in Åmål
• a web ring
• a jewelry ring (e.g. engagement ring, wedding band, promise ring, earring)
• an indentification ring, for example used in ornithology and modern falconry.
• a boxing ring
• planetary rings
• a business ring or crime ring, also called a crime syndicate
• a canal ring - a circular canal route
• a circus ring - akin to a stage
• a bathtub ring - soap scum buildup
• the rings used by male gymnasts
• a ring circuit is a type of cuircuit used in the British Isles where there are two paths from each socket to the consumer unit
• Juggling rings are a type of prop used for toss juggling, in which they are thrown and caught repeatedly by the juggler.
• processor rings: ring 0, where the kernel runs, and ring 3, where user-level applications and some drivers run. Rings 1 and 2 are often unused.

Things entitled ring

• Ring around the rosie
• The Opera cycle Der Ring des Nibelungen (The Ring of the Nibelung) is often referred to as "the Ring"
• Ring is the title of a 1998 Japanese cult horror film by Hideo Nakata
  • The Ring is an American remake of Ring.
• Ring is also the title of a science fiction novel by Stephen Baxter
• The One Ring of J.R.R. Tolkien's Middle-earth fiction
• Ring Magazine, a boxing magazine
• A Japanese professional wrestling promotion, RINGS.

de:Ring fr:Anneau it:Anello pt:Anel ru:Кольцо