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The signature can be anything, though.

I usually sign a big ‘X’, or draw a smiley face.

At my local watering hole they have you sign on an ipad that gives you the entire screen as a canvas that I exclusively use to leave lewd art.

One pixel is usually enough to pass input validation.

Sometimes they check for a line that crosses itself at least one time.

In this case someone named "Oleg"could have their signature deemed invalid if they dont cross the G/E and close the O? lol

... or 'jill'?