The expression "6^3" represents the mathematical operation of exponentiation, where the base is 6 and the exponent is 3. This means that 6 is multiplied by itself a total of three times: 6 × 6 × 6. Calculating this gives us 6 × 6 = 36, and then multiplying 36 by 6 results in 216. Therefore, 6^3 equals 216, which is also known as the cube of 6. This concept is commonly used in geometry, particularly when calculating the volume of a cube with side lengths of 6.