: A popular documentary series (though the episode count 509 would depend on specific season indexing). BTM Africa / BTM TV : Regional talk or variety shows.
: This indicates the video is in high-definition (HD) resolution ( btm.509.1080p.x265.wb.yourserie.com.rar
: A compressed archive file format that requires software like WinRAR or 7-Zip to extract the actual video file. Common Identifications for "BTM" : A popular documentary series (though the episode