t_font.printer_no

Can someone describe the purpose of t_font.printer_no?  It doesn't appear in the view of t_font from system tables.  We are having an issue with ticket designs where fonts some fonts are not available.  I have two sets of values in t_font.  One for printer_no 1 and one for printer_no 4.  I haven't encountered this issue before and the documentation I've read doesn't seem to address this column.

 

Thanks.