math mode - Real number symbol (UTF-8: ℝ) in XeTeX - TeX - LaTeX Stack Exchange
Special Symbols
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File:Latex integers.svg - Wikipedia
File:Latex real numbers square.svg - Wikipedia
LaTeX/Special Characters - Wikibooks, open books for an open world
Number sets symbols in LaTeX/Overleaf (Making the Real Numbers symbol) - YouTube
symbols - To make the numero sign, would N\textsuperscript{\underline{\scriptsize o}} be a valid alternative to \textnumero (from textcomp package) - TeX - LaTeX Stack Exchange
LaTeX for Physicists
How to write product(Π) and big Pi by prod command in LaTeX?
The Comprehensive LaTeX Symbol List - CTAN
How to write a real number(ℝ) symbol in LaTeX? | Real number symbol