This is the or "release group tag" indicating where the file originated.
The middle section of the filename, , is perhaps the most revealing regarding the file's origins.
It looks like you've shared a string of text that appears to be a file naming convention, likely from a downloaded video file.
If you are managing files with names like this, here is how to handle them effectively:
webdl stands for – a direct download of the video file from a streaming service, typically without re-encoding. This contrasts with a WEBRip (screen recording). WEB-DL files retain the original stream’s quality, including variable bitrates and exact frame rates.