Mathematics: Mathematical Symbol

$+ \!\,$	Addition	$- \!\,$	Subtraction
$\times \!\,$ or $\cdot \!\,$	Multiplication	$\div \!\,$ or $/ \!\,$	Division
$\int \!\,$	Integration	$\oint \!\,$	integration is over a closed surface
$\therefore \!\,$	Therefore, so. hence	$\because \!\,$	Because, Since
$\sqrt{\ } \!\,$	Square root	$\sqrt[4]{5}$
$\infty \!\,$	Infinity	$\propto \!\,$	Proportion
$=$	is equal to	$\ne$	is not equal to
$\approx$	approximately equal	$\sim$	is similar to
$\Leftrightarrow$	if and only if	$\Rightarrow \!\,$	implies; if ... then
$<$	is less than	$\ll \!\,$	is much less than
$>$	is greater than	$\gg \!\,$	is much greater then
$\le \!\,$	is less than or equal to	$\ge$	is greater than or equal to
$\subseteq \!\,$	sub set	$\supseteq \!\,$	super set
$\| \ldots \| \!\,$	absolute value of; modulus of	${\{\ ,\!\ \}} \!\,$	the set of ...
$\forall \!\,$	for all	$\exists \!\,$	there exist
$\in \!\,$	is an element of;	$\notin \!\,$	is not an element of



$\mathbb{C} \!\,$	Complex number	$\mathbb{N} \!\,$	Natural number
$\mathbb{R} \!\,$	Real number	$\mathbb{Z} \!\,$	Integer
$\mathbb{Q} \!\,$	Rational number	$\mathbb{Q} \!\,$	Irrational number

Mathematics