: Denotes the video resolution, specifically High Definition at 1280 x 720 pixels .
: Indicates the source material is from a Blu-ray Disc , which generally offers higher visual quality and fewer broadcast-related artifacts (like watermarks or censorship) than TV rips. gateanime-com-kds-bd-720hd-mp4
Filenames in unofficial anime circles follow a structured format to inform users of the source and quality: : Denotes the video resolution, specifically High Definition