The symbol "≠" represents "not equal to" in mathematics. It is used to indicate that two values or expressions are different from each other. For example, if we say 3 ≠ 5, it means that the number 3 is not equal to the number 5. This symbol helps in comparing quantities and solving equations. In programming and logic, "≠" serves a similar purpose. It is often used in conditional statements to check if two variables are unequal. For instance, in a programming language like Python, the expression `if a != b:` checks whether the value of variable a is not equal to the value of variable b.