Researchers who come to the SPLR facility give up their normal lives in society to dedicate themselves to deep research in the heart of political documentation. Many researchers decide to show off their dedication by adopting a SPLR tag, or a shortened, convenient handle different from their government assigned name. The SPLR tag also acts as a modicum of identity protection in the unlikely case of a SPLRnet data breach.
There is no strict format for SPLR tags, but typically researchers choose an all-caps 4 letter word, like BUBI.