This specific keyword string——refers to one of the most iconic high-definition releases of the Death Note anime series in the digital archiving and torrenting community.

: 1080p resolution encoded in x265 HEVC [10-bit] , optimized for 16:9 aspect ratio widescreen.

: This part seems to be a personal identifier or a tag that the person who uploaded or shared the file has used. It could be a username or a handle.