Or

• 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
• Outdoor Research, a manufacturer of sporting equipment is also referred to as OR

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