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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 on 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 to true or false based on the two input expressions.
The symbol for approximately equal is a squiggly equals sign. It is used to show that two numbers are roughly equal, but not exactly equal.