i would also consider the use of font styles syntax highlighting... I saw such a thing in Turbo Pascal 5.5 for the first time and the only thing they did was the use of bolding for language keywords, like in this book: http://bitsavers.informatik.uni-stuttgart.de/pdf/borland/tur... then in Delphi 1.0: https://winworldpc.com/screenshot/c38bc3b1-c3a1-2a2d-6211-c3... and in upcoming versions, it started to use italic for comments, but still no colors, yet we called it syntax highlighting. but my memories might be inaccurate :)