in rocksmith 2014, these certain notes come up in the song and it looks like a palm mute except it has white X inside the square, can someone tell what that certain note is called and how it works, is there a lesson for it?

Its a fret hand mute, play the string but dont press dont on the fret

 

Source: http://imgur.com/a/vlxTS

Frethand Mutes 101 in Rocksmith 2014's Lessons section :)

There are no stupid questions, only stupid answers, and of course plenty of stupid people :)