What does XXI mean in Mathematics?

This page is about the meanings of the acronym/abbreviation/shorthand XXI in the Academic & Science field in general and in the Mathematics terminology in particular.

Roman Numeral 21

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What does XXI mean?

twenty-one, 21, XXI(adj)
the cardinal number that is the sum of twenty and one

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"XXI." Abbreviations.com. STANDS4 LLC, 2016. Web. 28 Aug. 2016. <http://www.abbreviations.com/term/282245>.