What does this notation mean? Leibniz's notation for second derivative?

Hi everyone,

I have come across the following notation and I'm not sure what it means:
Attachment 21093

I thought it meant the second derivative but I have only ever seen that denoted:
Attachment 21094

Can anyone help me out here?

Thanks, Tim.

It doesn't mean anything. It is probably a misprint for the second derivativel,


The other possibility is that it is a misprint for
.