Production Assistant
1. A production assistant, also known as a PA, is a job title used in filmmaking and television for a person responsible for various aspects of a production. The job of a PA can vary greatly depending on the budget and specific requirements of a production as well as whether or not the production is unionized.
In unionized television and feature film, production assistants are usually divided into different categories: “Set PA”, “Truck PA”, “Locations PA”, “Office PA”, or “Set Runner” and “Extra PA or Daily” – Variations exist depending on a show’s structure or region of the United States or Canada.
Source: Wikipedia