Sooryavanshi--2021--web-dl-hindi-full-movie-download-720p-1080p-480p---rskg Page

These represent the available video resolutions (Standard Definition, High Definition, and Full HD).

That string looks like a standard used by online movie release groups or file-sharing sites. It breaks down the specific technical details of a digital video file:

This is likely the "tag" or "initials" of the specific uploader or release group responsible for encoding and sharing the file.