Found a
Claudius Gothicus with the "DIVS
AVG" spelled out as "DIIIIIIIIIIG". But notice the lazy S. Looks like after carving in all the I's, the engraver
had to account for the missing letter, and rather than starting over with a new die, he carved loops in to connect the I's and make the S that you see.
Grammar Nazis are as old as civilization, apparently.
EDIT: When I examine at it up close, it looks like the I's came first and then the swoops. But perhaps the engraver appreciated the clean, tidy line of IIIIIIIIII, and wanted
his S to fit in stylistically.