The file tag "[BD 1080p RoSub]" already covers the technical details: BD: Blu-ray source. 1080p: Full HD resolution.
In the context of that specific file name, is not a standard technical tag. Instead, it is highly likely a misinterpretation or typo related to one of the following: [Anime Kage] Bleach - 358 [BD 1080p RoSub].mp4
In rare cases, it might be a fragment of a larger sentence or a mistranslation from the Romanian site where the file originated (e.g., a "piece" of a collection or "piesa," which can mean "piece" or "part" in Romanian). The file tag "[BD 1080p RoSub]" already covers
Romanian Subtitles (the uploader "Anime Kage" is a well-known Romanian fansub group). [Anime Kage] Bleach - 358 [BD 1080p RoSub].mp4