What does PR1, PR2, PR3 etc. mean?

What does PR1, PR2, PR3 etc. mean?

digg 12:21 PM
Hi, everyone. I'm a newbie to this section. Can anyone tell me what a PR1, 2 or 3 means? :eek:

I've been noticing those things in many signatures and WTS ads. Thanks ahead for your replies.

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