Signature on the Check Priting

Hello Experts,

As we have to support mutliple country's SAP Systems, We have different landscapes. There is a new requirement to add signature on Check Priting Form from country A. As we already have implemented this functionality in other country's landscape(which was implemented 10years back). So when I looked at the SAPScirpt(Z_PRENUM_CHECK) to see how it was designed, there is a window for Signature.

The text-element for this window is:

*PRINT-CONTROL ZDABC
!"#$%&'()*
+,-./01234
56789:;<=>
?@ABCDEFGH

Before looking at this Text-Element, I had expected that they would have uploaded a .tiff file of signature and used it for printing.

PS: The Print Program RFFOUS_C was never changed. I have searched for the Print Control ZDABC in SPAD and could not found.

Can anybody please explain what does that symbol mean and how the signature functionality was implemented?

Thanks.