European Economic Area Family Permit
A European Economic Area Family Permit (short: EEA family permit) was an immigration document that assisted the holder to enter the United Kingdom as a family member of a citizen of a contracting state to the European Economic Area agreement or a Swiss citizen. They were issued by the UK immigration authorities under the Immigration (European Economic Area) Regulations 2006 (UK).
Source: Wikipedia — European Economic Area Family Permit (CC BY-SA 4.0)