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:{{math|'''C'''}} – [[complex number]]s
:{{math|'''N'''}} – [[natural number]]s
:{{math|'''Q'''}} – [[rational number]]s (from ''[[quotient]]'')
:{{math|'''R'''}} – [[real number]]s
:{{math|'''Z'''}} – [[integer]]s (from ''Zahl'', German for ''[[integer]]'').
Some authors use the [[blackboard bold]] font for these particular sets (<math>\mathbb{C}</math>, <math>\mathbb{N}</math>, etc.). This usage is widely accepted in handwriting, but many mathematicians, and such experts on mathematical typography as [[Donald Knuth]], advise against its use in print.<ref>Krantz, S., ''Handbook of Typography for the Mathematical Sciences'', Chapman & Hall/CRC, Boca Raton, Florida, 2001, p. 35.</ref>
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