: These films are often part of "Nano" or "Hybrid" series (hence "HN") that use ceramic or metallic particles to reject heat without interfering with electronic signals.
: The filename "HNTV-004 Mp4" suggests it could be part of a series, possibly identified by the "HNTV" prefix, with "004" indicating it's the fourth item in that series. The "Mp4" extension confirms it's a video file encoded in MPEG-4, a common format for video files. HNTV-004 Mp4HNTV-004 Mp4 12
It could denote a 2012 vintage for older archived footage. : These films are often part of "Nano"