=The equals sign '=' is a mathematical symbol used to indicate equality between two expressions. It asserts that the values on either side of the sign are equivalent.
Simple equation showing equality between two expressions.
x + 2 = 5Pythagorean theorem representing the relationship between the sides of a right triangle.
a^2 + b^2 = c^2Function definition showing the expression for f(x).
f(x) = x^2 + 3x + 2