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.
Shows the object type and ID. Below examples:
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PART 780*380 Id: 227
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ASSEMBLY Id: 144
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MESH Id: 946
Note that object IDs are temporary, and may change when you reopen a model, or use the read in command in Tekla Model Sharing, for example.