041 Subfield $i - Language code of intertitles:

Subfield $i is used for silent films and contains the language code(s) of the intertitles or title cards.  Intertitles are filmed text that is shown between scenes of a silent film to provide dialogue or narrative context.

Example:

041  1#  $ifre$jeng$jger

[DVD with intertitles in French and subtitles in English and German.]