This is likely a "release group" tag. These groups are the digital archivists (or pirates) who encode and distribute media.
This is the funniest part. It suggests the file has been renamed or converted multiple times. It likely started as a high-quality Matroska (.mkv) file, was converted to an .mp4 for compatibility (like playing on a phone or TV), and then perhaps renamed again by a script or an over-cautious uploader. This is likely a "release group" tag
This indicates the file contains a Tamil dub or subtitles, making the show accessible to the millions of fans in South India and the diaspora. This is likely a "release group" tag