What does 4x4 stand for?

4x4 stands for "four-by-four"

How to abbreviate "four-by-four"?

"four-by-four" can be abbreviated as 4x4

What is the meaning of 4x4 abbreviation?

The meaning of 4x4 abbreviation is "four-by-four"

What does 4x4 mean?

4x4 as abbreviation means "four-by-four"