Symbols:R

The Set of Real Numbers
$$\R$$

The set of real numbers.

Its LaTeX code is \mathbb{R}, \reals or \R.

The Set of Non-Zero Integers
$$\R^*$$

The set of non-zero real numbers: $$\R^* = \R - \left\{{0}\right\}$$.

Its LaTeX code is \mathbb{R}^*, \reals^* or \R^*.