Or

OR and/or or may stand for:

In logic, or is a propositional operator that captures some of the meaning of the English conjunction "or"; see Logical disjunction.
In heraldry, Or is the tincture with the colour golden (or yellow). It is usually spelt with a capital letter to distinguish it from the conjunction.
Oregon, abbreviation for the US state
Oristano, abbreviation for the Italian comune
Oriya language (ISO 639 alpha-2, or)
Operating Room
In applied mathematics, OR is an abbreviation for Operations Research, or Operational Research, the use of mathematical models, statistics and algorithms to aid in decision-making.
In Olympic Games OR is the abbreviation for Olympic Record.
Owasco River Railroad (AAR reporting mark OR)
Outdoor Research, a manufacturer of sporting equipment is also referred to as OR
Or (Afghanistan), a location in Afghanistan.
Or (Crimea), a region in Crimea.

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Categories: Disambiguation | Lists of two-letter combinations | Heraldic tinctures