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  • ° : degree (symbol: °) used for degrees of arc / hours / temperature etc.
  •  : diameter (symbol: ) diameter of a conic section is typically defined as any chord which passes through the conic's centre
  • µ : micro (symbol: µ) is a prefix in the SI and other systems of units denoting a factor of 10-6 (one millionth)
  •  : numero (symbol: ) abbreviation of the word number(s) indicating ordinal numeration
  • Ω : ohm (symbol: Ω) is the SI derived unit of electrical resistance