What does P..R stand for?

What does P..R mean?

PR	Press Release Community » Media
PR	Pier Miscellaneous » USPS
PR	Public Relations Community » Educational
PR	Public Relations Governmental » FDA
Pr	Poor Miscellaneous » Coins
PR	Press Release Business » General
PR	Pair Governmental » Military
PR	Pair Governmental » NASA
PR	Proof Miscellaneous » Coins
PR	Puerto Rico Regional » Countries
PR	Puerto Rico Regional » States
PR	PRobability Academic & Science » Mathematics
PR	Page Rank Computing » General
PR	Puerto Rican Governmental » US Government
PR	Previously Reported Business » General
PR	Progress Report Governmental » US Government
PR	Public Radio Community » Media
PR	Punk Rock Community » Music
PR	Personal Relationships Community
PR	Person Responsible Community » Law
PR	Person Responsible Governmental » Military
PR	Person Responsible Governmental » US Government
PR	Permanent Resident Governmental » US Government
PR	Progesterone Receptor Medical » Laboratory
PR	Proportional Representation Governmental » US Government