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.

NUMBER shows the revision number in Rev. No box in the Revision Handling dialog box.

NUMBER#1 shows the total number of objects on a list. Shows the total number of parts and bolts for one assembly for list types ASSEMBLY, ASSEMBLY_BOLT, ASSEMBLY_PART and ASSEMBLY_ALL, if the object is part of an assembly on the list.

NUMBER#2 shows the project number as text.