The expression "3 × 7 × 7" represents a multiplication problem involving three numbers: 3 and two instances of 7. To solve this, you first multiply 7 by 7, which equals 49. Then, you multiply that result by 3. So, the complete calculation is 3 × 49, which equals 147. This means that the product of 3, 7, and 7 is 147. This type of multiplication is often used in various fields, including mathematics and science, to find total quantities or to solve problems involving groups of items.