This is likely a "tag" or shorthand for the uploader or the website (in this case, SkymoviesHD). (2003): The release year of the film.

The name of the website where the file originated.

The resolution. This is Full High Definition (1920 x 1080 pixels).

The string you provided is a specific filename typically found on file-sharing or torrent sites. If you are trying to understand what those letters and numbers mean, 🔍 Decoding the Filename

The video compression standard (codec). It is the most common format for high-quality video at smaller file sizes. ESubs: English Subtitles are included in the file.