Sixty Symbols, stylized as SIXTΨ SγMBΦLS, is an Internet show which focuses on physics. It was created by Brady Haran and is produced through the University of Nottingham. It was originally planned to cover sixty topics for which physicists use a specific symbol, hence the title, but, due to its popularity, it has grown to cover over 320 physics topics.
I found Sixty Symbols some time around 2010 while watching one of Brady Haran's other shows, Periodic Table of Videos. After watching a few episodes, I found it to be really interesting and watched a lot of the back catalog.