How to write a real number(ℝ) symbol in LaTeX? | Real number symbol
DeTeXt - an iOS app that can find the LaTeX command for symbols that you draw. It can detect all math symbols as well as symbols from tipa, amsmath, amssymb and more :
Writing Equations/Symbols in LateX | by Adrienne Kline | Geek Culture | Medium
LaTeX Math Symbols
LaTeX Math Symbols
math mode - How to make this curly 'R' (ℛ)? - TeX - LaTeX Stack Exchange