It’s the designation for a four-wheel-drive vehicle — most often used to represent one with true offroad capability.
The first numeral in the 4x4 designation stands for the number of wheels, and the second represents the number of wheels powered or driven. Thus, the average passenger car is a 4x2. A motorcycle is a 2x1. Obviously, it’s impossible to drive a 2x4, but you can drive to the lumber yard, buy some 2x4s, throw them in the back of your 4x4 or 4x2 and drive to your home 20.
Information for this was taken from the Cars.com’s glossary, written by Joe Wiesenfelder.
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