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Singleton (Unicode)
Last updated at 1:15 pm UTC on 16 December 2015
Certain characters are known as singletons. They never remain in the text after normalization. Examples include the angstrom and ohm symbols, which map to their normal letter counterparts a-with-ring and omega, respectively.

http://www.unicode.org/reports/tr15/

Singleton_Unicode_2015-12-16.png