The fixed point o across space is made into three mutually perpendicular number axes, all of which take o as the origin and have the same unit length. These three axes are called X axis (horizontal axis), Y axis (vertical axis) and Z axis (vertical axis) respectively, and are collectively referred to as coordinate axes. The order between the axes should conform to the right-handed rule, that is, the right hand holds the Z axis, so that the four fingers of the right hand turn from the positive direction of the X axis to the positive direction of the Y axis, forming a 90-degree right angle. At this time, the direction pointed by the thumb is the positive direction of the Z axis. The coordinate system composed of these three axes is called right-handed rectangular coordinate system, which corresponds to left-handed rectangular coordinate system. The right-handed rectangular coordinate system is commonly used in general mathematics, which is different in other disciplines because of its convenient application. Any two of the three coordinate axes can determine a plane, which is called a coordinate plane. They are: XOY plane determined by X axis and Y axis; YOZ plane determined by y axis and z axis; XOZ plane defined by x-axis and z-axis. These three mutually perpendicular coordinate planes divide the space into eight parts, and each part is called a divination limit. The divination limit located on the positive semi-axis of X, Y and Z axes is called the first divination limit. Starting from the first divination limit, the divination limit above XOY plane is called the second, third and fourth divination limit in turn counterclockwise. The hexagrams below the first, second, third and fourth hexagrams are called five, six, seven and eight diagrams in turn. Specific concepts: take a point o in space as the origin, and establish three mutually perpendicular number axes; X-axis, Y-axis and Z-axis. At this time, the spatial rectangular coordinate system Oxyz is established, where the O point is called the coordinate origin, the three axes are collectively called the coordinate axis, and the plane determined by the coordinate axis is called the coordinate plane. ?

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