The expression "b²" represents the mathematical operation of squaring a number, where "b" is any real number. Squaring a number means multiplying it by itself, so b² = b × b. This operation is commonly used in various fields, including algebra, geometry, and physics. In geometry, b² often appears in the formula for the area of a square, where "b" represents the length of one side. The area is calculated as A = b², indicating that the area increases rapidly as the side length increases. Understanding b² is essential for solving many mathematical problems.