Long Answer:
http://www.chess.com/article/view/chess-ratings---how-they-work
Short Answer:
It is a deviation (ratings).
Basically, you can multiply that number by 2.
Subtract the new number from your score and that would be your "lower limit playing strength"
Add the new nember to your score and that would be your "upper limit playing strength".
I guess another way to look at it is the larger the Glicko RD, the less accurate your rating is.
hey playa's
just need a quick answer. I am still fairly new here. and i want to know what the GLICKO RD stat means on the profile page. just curious? in advance of answer,,,,, THANKS FOR THE HELP GUYS.