Man pages matching name dlopen in section 3:

dlopen.3.en	debian 10 / manpages-dev
dlopen.3.es	debian 10 / manpages-es
dlopen.3.ja	debian 10 / manpages-ja-dev
dlopen.3.pl	debian 10 / manpages-pl-dev
dlopen.3.pt	debian 10 / manpages-pt-dev
dlopen.3.en	debian 11 / manpages-dev
dlopen.3.ja	debian 11 / manpages-ja-dev
dlopen.3.pt	debian 11 / manpages-pt-dev
dlopen.3.en	debian 12 / manpages-dev
dlopen.3.fr	debian 12 / manpages-fr-dev
dlopen.3.ja	debian 12 / manpages-ja-dev
dlopen.3.ru	debian 12 / manpages-ru-dev