: Indicates the source material is a Blu-ray Disc , which usually means higher quality and fewer censorship bars compared to TV broadcasts.
: The file container format, which is compatible with almost all modern devices.
: The source website or the group that encoded/uploaded the file (GateAnime).
This text appears to be a , specifically a high-definition anime episode or movie from a distribution site.
: Likely an abbreviation for the title of the anime (e.g., Bleach ). 004 : The episode number or volume number.
