What is this icon?

[Ramsey Bolton]

We have a form that students use to get signatures from their professor. The student has submitted a form with a blank signature line, but there is this small icon that doesn't seem to have any function. The student says that she can see the signature on her screen, but two of us with different versions of acrobat can't see it here in our office.

Strangely enough, I can see the signature if I preview the PDF in Outlook, but I only see the icon when I open in Acrobat Reader DC.

Move from Acrobat Reader /Acrobat DC for Mobile (Japan) to Acrobat Reader (us) [moderator]

[Bernd Alheit · Accepted solution]

It is the indicator of a signature field.