The symbol "√2" represents the square root of 2, which is a mathematical constant. It is the positive number that, when multiplied by itself, equals 2. The value of √2 is approximately 1.41421356. This number is classified as an irrational number, meaning it cannot be expressed as a simple fraction. √2 is significant in various fields, including geometry and engineering. For example, in a right triangle with both legs measuring 1 unit, the length of the hypotenuse is √2 units, according to the Pythagorean theorem. This property makes √2 important in calculations involving triangles and circles.