z axis

A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length. Each reference line is called a coordinate axis or just axis of the system, and the point where they meet is its origin, usually at ordered pair . The coordinates can also be defined as the positions of the perpendicular projections of the point onto the two axes, expressed as signed distances from the origin.

Underground Development (formerly known as Z-Axis Games) was a video game developer founded in 1994 by David Luntz. The first game they began developing was Madden NFL '96 for the Sega Genesis. The studio continued to make primarily sports and extreme sport games for the rest of its career. The first extreme sports game Z-Axis created was , published by Rockstar Games.