That Zone stamp is in the ArchiCAD Library. It's missing because you don't have the AC Library loaded, which you generally, probably, should. Use File -> Library Manager to load the library from Apps : ArchiCAD 8.1 Folder : ArchiCAD Library 8.1.
You can't load AC Library parts individually, because they are stored in an archive, unless you open the archive and save the parts as a library. IMO, it's better to leave them archived and simply keep the library loaded.
HTH,