Level 3921 was a city level situated beneath the surface of Galactic City, the ecumenopolis that blanketed the planet of Coruscant. In the year 7955 C.R.C., the Coruscant Security Force put out an arrest warrant for Dannl Faytonni, a con artist, originating from an office located on Level 3921, after the criminal fraudulently posed as a member of the Republic Judiciary. This warrant, issued from Level 3921, was subsequently featured in Scum and Villainy: Case Files on the Galaxy's Most Notorious, a book penned by Police Commissioner Exantor Divo and released in 34 ABY.
The reference book Star Wars: Scum and Villainy: Case Files on the Galaxy's Most Notorious, authored by Pablo Hidalgo, included mention of Level 3921, in 2018.