We are adding the value REFERENCE as value to the W24RoughnessStandard.
This is not a true standard, but ISO 1302 allows the specification of reference roughnesses.
These are "shorthands" specified in the title block that avoid the repetition of the symbols on the drawing itself.
The concept is not unique to ISO 1302 and simple enough to justify the usage of its own standard value.
We are adding the value REFERENCE as value to the W24RoughnessStandard. This is not a true standard, but ISO 1302 allows the specification of reference roughnesses.
These are "shorthands" specified in the title block that avoid the repetition of the symbols on the drawing itself. The concept is not unique to ISO 1302 and simple enough to justify the usage of its own standard value.