These were called Geek codes (it took me a while to recall the name!). I remember them being pretty popular during the Usenet era. https://en.wikipedia.org/wik

These were called Geek codes (it took me a while to recall the name!). I remember them being pretty popular during the Usenet era. https://en.wikipedia.org/wiki/Geek_Code https://en.wikipedia.org/wiki/Geek_Code