ℝ

See also: Appendix:Variations of "r"

ℝ U+211D, ℝ
DOUBLE-STRUCK CAPITAL R
← ℜ
[U+211C] 		Letterlike Symbols ℞ →
[U+211E]

Translingual

Etymology

In Stetigkeit und irrationale Zahlen (1872) Richard Dedekind uses R to denote rational numbers and ℜ to denote real numbers. The usage of blackboard bold dates to the 1960s.

Noun

ℝ

  1. (mathematics) The set of real numbers.
  2. (mathematics) This set, equipped with any of its standard structure; the real line.

Derived terms
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