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 attribute shows the bending angles of the reinforcing bars based on the mappings in the rebar_schedule_config.inp file, located in the ..\ProgramData\Trimble\Tekla Structures\<version>\environments\<environment>\system folder. These mappings are environment-specific by default. You can modify them to suit your company or project needs.