What directions do the X axis, Y axis and Z axis represent respectively?

X axis (horizontal axis), Y axis (vertical axis), Z axis (vertical axis).

When three coordinates are used, the x, y and z axes are set. These three axes are actually the three directions of three-dimensional space, namely the horizontal axis and the vertical axis. Generally, X is the horizontal axis, Y is the vertical axis, and Z is the vertical axis.

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After taking the rectangular coordinate system O-xyz, we can establish a one-to-one correspondence between points in space and ordered arrays.

Let the point m be a point in space, and the passing point m be planes perpendicular to the X-axis, Y-axis and Z-axis respectively. Let the intersections of three planes with X-axis, Y-axis and Z-axis be P, Q and R in turn, and the points P, Q and R are called the projections of point M on X-axis, Y-axis and Z-axis respectively. Let the coordinates of points P, Q and R on the X-axis, Y-axis and Z-axis be X, Y and Z in turn, then point M determines an ordered array X, Y and Z. ..