World Citizen Identification Card
From Tardis Wiki, the free Doctor Who reference
A World Citizen Identification Card was a form of ID used on Earth in the 61st century and was expected to be presented upon arrival at an airport.
When River Song landed at Shangri-La International Airport, she was asked for her World Citizen Identification Card and used her variable ID, supplied by Garrison Clay, to gain entry. (AUDIO: Last Words [+]Loading...["Last Words (audio story)"])
