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- ° : degree (symbol: °) used for degrees of arc / hours / temperature etc.
- № : numero (symbol: №) abbreviation of the word number(s) indicating ordinal numeration
- µ : micro (symbol: μ) is a prefix in the SI and other systems of units denoting a factor of 10-6 (one millionth)
- Ω : ohm (symbol: Ω) is the SI derived unit of electrical resistance
