Ring

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Ring is a Germanic word with various cognates (e.g. identical in Dutch and German) for a circular form, object or concept. It may specifically refer to:

[edit] Jewelry

Though size and colour may vary by purpose and artistic design, the basic shape is always circular. They can have symbolical meanings and uses, e.g. as insignia.

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[edit] Science and engineering

  • Ring structure, in chemistry, molecules such as aromatic hydrocarbons and heterocyclic compounds
  • Ring molecule or cyclic molecule, in chemistry, molecules such as cycloalkanes
    • Small cycloalkanes can experience ring stress
  • Planetary ring, a flat disc-shaped ring of matter orbiting a planet
  • Growth rings, usually a synonym for tree rings
  • Ring species, populations in biology which are difficult to properly categorize into separate species
  • Ring circuit, ring final circuit
  • Ring armature, in electric motors
  • O-ring, a loop of elastomer with an o-shaped cross-section, used as a mechanical seal
  • Piston ring, an open-ended ring that fits into a groove on the outer diameter of a piston

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