Man pages matching name unicode::stringprep::unassigned in section 3pm:

Unicode::Stringprep::Unassigned.3pm.en	debian 10 / libunicode-stringprep-perl
Unicode::Stringprep::Unassigned.3pm.en	debian 11 / libunicode-stringprep-perl
Unicode::Stringprep::Unassigned.3pm.en	debian 12 / libunicode-stringprep-perl