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 stands for "Web Download." It means the file was losslessly ripped from a streaming service like Netflix, Amazon Prime, or Disney+, rather than being recorded in a theater (CAM) or ripped from a physical disc (BluRay). Hindi: The primary audio language of the file.
This is likely the "tag" or "initials" of the specific uploader or release group responsible for encoding and sharing the file.