Units: one of the most commonly used commands
Units command is used to control the precision and display formats for coordinates, distances, and angles. The shortcut key is UN.
How to change a drawing’s unit from millimeter to meter?
First of all, let’s get this straight: millimeter or meter is meaningless for a single drawing, for example, the drawing unit is set to millimeter, and you draw a line of 1000 units long, then you change the drawing units to meter, but the line is still 1000 units long.