P Per country limitation: All countries are limited in the number of their nationals that may become permanent residents of the U.S. every year. While most countries never reach the maximum amount allowed, a few countries' nationals are applying to become permanent residents of the U.S. in numbers that exceed the number allowed from those countries. Those countries are deemed "oversubscribed". These backlogs have been accruing for many years with waiting periods from one to twenty years in some categories.
  Prevailing Wage: The amount of base salary an employer must pay its foreign workers. Bonuses and commissions cannot be included in this figure.
R Refugee: Any person who is outside his or her country of nationality who is unable or unwilling to return to that country because of persecution or a well-founded fear of persecution. Persecution or the fear thereof must be based on the alien’s race, religion, nationality, membership in a particular social group, or political opinion.