What is a PE?
A PE is a licensed Professional Engineer. To become licensed, engineers must complete a four-year college degree, work under a Professional Engineer for at least four years, pass two intensive competency exams and earn a license from their state's licensure board. Then, to retain their licenses, PEs must continually maintain and improve their skills throughout their careers.
What makes a PE different from an engineer?
See more at: http://www.nspe.org