Curious about a mark on $20.00 Bill

Hello everyone, Got this $20.00 bill back in change and I noticed this blue mark. Just wondering was this mark made by the mint when printing this bill?

Thank you

 

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Probably a test mark/stamp from a bank to see if the bill was genuine.

 

Teller stamp.

 

Agreed with above,now if you find something like this don't keep it to yourself.

 

I consider the stamp a “Chopmark”, typically seen on $100 notes returning from foreign countries. You can read about them here. - https://www.coinbooks.org/esylum_v17n07a21.html

 

Answered above, but one wonders what the stamp stands for.

 

Thank you for the link, interesting info I had no idea there were coin also called chop marks. So now have to ask is this coin considered a chop mark coin? Did some more googling and found this coin so I'm assuming my coin is considered a chopmark coin. Thanks again for the information.