4x4

Etymology 1
From its dimensions (4 inches by 4 inches); the 'x' is a corruption of the multiplication symbol ×.

Noun

 * 1) A piece of timber with a cross section of 4 inches square.

Etymology 2
From four-wheel drive and four-speed.

Noun

 * 1)  A four-wheel-drive vehicle with a four-speed transmission.
 * 2)  A four-wheel vehicle with four-wheel drive.
 * 3)  Any vehicle with four-wheel drive.

Derived terms

 * - (4x4 with 4-wheel steering)

Related terms

 * 4-wheel vehicle with 2-wheel-drive(2WD)

Etymology
Same as English Etymology 2

Noun

 * , 4WD