The term "z축" refers to the z-axis in a three-dimensional coordinate system. In this system, the z-axis is typically oriented vertically, perpendicular to both the x-axis and y-axis. It is used to represent depth or height in spatial representations, allowing for a more comprehensive understanding of objects in 3D space. In various fields such as mathematics, physics, and computer graphics, the z-axis plays a crucial role in modeling and visualizing three-dimensional objects. By incorporating the z-axis, one can accurately depict the position and orientation of objects, enhancing the ability to analyze and manipulate them in a virtual environment.