The modulus of symbols on cad paper indicates the equipment code.

The modulus of graphic symbols on cad drawings does not represent the equipment code. According to relevant public information, the graphic symbol SJ is the meaning of equipment code. There are too many names in cad drawings, so use symbols instead. In the process of drawing cad drawings, symbol marking is very important and essential, such as roughness, geometric tolerance, datum, welding symbol, elevation symbol and so on.