20x20 is a mathematical expression that can be interpreted in different ways. Here are the different interpretations based on the search results:

• Multiplication: 20x20 can be interpreted as a multiplication of two numbers, which equals 400.

• Area: 20x20 can also refer to the area of a square or a room with sides of 20 feet each. In this case, the area is 400 square feet.

It is important to note that the context of the question is crucial in determining the correct interpretation of 20x20.