Dunno about the serial number, but that's some fancy-looking gibberish scrawled on the notebook paper above it!
It is considered a triple number Bookend 872 87 872 and a Trinary Serial number.. only 3 numbers 2, 7 & 8 Maybe about $5.00 this time on Ebay
Personally and respectfully, you could probably make up a term or nickname for any random 8 serial numbers on a currency note and there might possibly be someone out there willing to pay you more than face value. I have never heard of a triple number bookend. Just ask yourself, would you pay a premium for this heavily circulated note with this serial number ? Once again, if you like it, keep it. It's only a buck.