XS_HIDDEN_NORTH_MARK_SYMBOL
Category in Advanced options dialog: Marking - parts
By default hidden North mark symbol is number 32 in the xsteel.sym symbol file. To change the symbol, set this advanced option to a different symbol number.
For more information about symbols in Tekla Structures, and checking the symbol files, see Add symbols in drawings.
This advanced option is model specific and the setting is saved in the options database.