It looks like you're referring to a release tag for a specific download of the TV show , specifically the Season 1 finale episodes 23 and 24 ("The Woman" and "Heroine").
If you are looking for this specific version, it is highly regarded because: _DLMux_720p_-_-_Ita_Aac_Elementary_S01E23-24_-_...
: Combining E23 and E24 ensures you get the full story arc of the finale without missing the transition between the two parts. It looks like you're referring to a release
: This indicates it is a "Digital Layer Multiplex," meaning the video was likely taken from a high-quality web source (like iTunes or Amazon) and "muxed" (combined) with other audio tracks. 720p : High-definition resolution (1280x720). _DLMux_720p_-_-_Ita_Aac_Elementary_S01E23-24_-_...