≈
Symbol  Format  Data 

≈  Code Point 
U+2248 
TeX 
\approx 

SVG 
The approximately symbol (≈) is used in math to indicate that two expressions are approximately equal to each other. Typically, the symbol is used in an expression like this:
In plain language, this means that the constant (pi) is approximately equal to the value . In reality, the value of the constant is irrational and continues forever.
The equals symbol or equal sign is used in mathematics to assert that two expressions have the same value. It is also used in boolean logic as an operator, evaluating true or false based on the two input expressions.
The symbol for not equal is an equal sign with a diagonal line through it. The symbol is used in math to indicate that two expressions are not equal to each other.