Fun fact: The SF innovation center of Visa has t-shirts which literally say "The Mark" on them. Though supposedly in reference to [this guy](https://usa.visa.co

Fun fact: The SF innovation center of Visa has t-shirts which literally say "The Mark" on them. Though supposedly in reference to [this guy](https://usa.visa.com/visa-everywhere/innovation-centers/san-francisco/the-inside-edge/innovators/mark-nelsen.html https://usa.visa.com/visa-everywhere/innovation-centers/san-...).