Iso 2768 M H -

In ISO 2768, "m" and "H" refer to the tolerance classes for linear dimensions.

This comes from ISO 2768-1 , which covers linear and angular dimensions. The "m" stands for the medium tolerance class, the most widely used standard in CNC machining and general manufacturing because it balances cost with functional accuracy. iso 2768 m h

For mathematical expressions that I may use, I will use $$ syntax without newlines, for example: $$x+5=10$$. In ISO 2768, "m" and "H" refer to

Same values as flatness for the shorter side. In ISO 2768