What is this internal motherboard component connected to?

[zigibogido]

I'm purchased and old home theater system and am attempting to repair it. I found this piece disconnected, and it looks like it gets attached to an internal board under a screw. I have found a schematics pdf, but because I don't what it does, I can't think of the right keywords to use.
http/imgur.com/a/ITbpu

 

[Seanie280672]

I'm purchased and old home theater system and am attempting to repair it. I found this piece disconnected, and it looks like it gets attached to an internal board under a screw. I have found a schematics pdf, but because I don't what it does, I can't think of the right keywords to use.
http/imgur.com/a/ITbpu

Just looks like a grounding strap of some sort, the other end would of been connected to something else at some point, but has been cut off. The ring end would go under one of the motherboard mounting screws.