: Indicates "Dual Audio," meaning the file contains both the original English audio track and a Hindi dubbed version.
File naming formulas use "tokens" to describe the content without needing to play the file. Based on common conventions for movie files , here is what each part of that string signifies: : The title of the movie, Iron Man 2 (2010). 2010 : The original theatrical release year.
: The name of the third-party website or "release group" that uploaded or encoded this specific file.
: The video resolution. This is Standard Definition (SD), which is lower quality than modern 1080p or 4K standards.