What is the difference between a 4WD SUV and a 4×4?

Is there any difference? I called a rental car to rent a 4WD SUV and they said,"Do you mean a 4x4?" I thought they were the same thing.

Also, bonus points to someone who can tell me what the numbers signify. I know one of them tells you if it is a 2WD or 4WD, but what's the other number for?

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What is the difference between a 4WD SUV and a 4×4?

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