ROUNDING_RADIUS, ROUNDING_RADIUS_1, ROUNDING_RADIUS_2
This is a template attribute. Template attributes can be used in filtering, or to retrieve data from the model to use in drawings and reports. For example, when you create a report, Tekla Structures replaces the attributes added in the report template with the corresponding object property values.
This template attribute shows different rounding radii of profiles. Below as an example rounding radius 1 and 2 for a specific I profile: