Noob question, what is a ringer?

[blackdata666]

Hey guys,
I just begin playing cs competitivly and i would like to know what is a ringer, and what is his role.
I would like to know why players put a [A] after their name sometimes.

Thanks alot!
hope you understood my question, because i speak french
Blackdata

[lhilman5]

A ringer is a player that ring for any team for a pug.
[A] Its the most known club in CS 1.6. I think it stands for Grade-A. Well, some people think they are cool by wearing that tag.