I found this reference for Hershey Vector font https://paulbourke.net/dataformats/hershey/ https://paulbourke.net/dataformats/hershey/ It seems to describe a

I found this reference for Hershey Vector font https://paulbourke.net/dataformats/hershey/ https://paulbourke.net/dataformats/hershey/ It seems to describe a "pen" which draws the character. It is indeed pretty cool!