There are currently 2 names in this directory beginning with the letter P.
PA stands for Page Authority. Similar to Domain Authority, Page Authority is a metric developed by Moz that predicts how well a specific page on a website will rank on SERPs. Page Authority is based on a scale of 0 to 100, with higher scores indicating a greater likelihood of high search engine rankings.
PBN stands for Private Blog Network. It is a collection of websites that are controlled by a single entity or organization, and are used for the purpose of manipulating search engine rankings.