Man pages matching name fd in section 4:

fd.4.en	debian 10 / fdutils
fd.4.de	debian 10 / manpages-de
fd.4.es	debian 10 / manpages-es
fd.4.it	debian 10 / manpages-it
fd.4.ja	debian 10 / manpages-ja
fd.4.pl	debian 10 / manpages-pl
fd.4.pt	debian 10 / manpages-pt
fd.4.en	debian 11 / fdutils
fd.4.de	debian 11 / manpages-de
fd.4.es	debian 11 / manpages-es
fd.4.it	debian 11 / manpages-it
fd.4.ja	debian 11 / manpages-ja
fd.4.pl	debian 11 / manpages-pl
fd.4.pt	debian 11 / manpages-pt
fd.4.pt_BR	debian 11 / manpages-pt-br
fd.4.en	debian 12 / fdutils
fd.4.de	debian 12 / manpages-de
fd.4.es	debian 12 / manpages-es
fd.4.fr	debian 12 / manpages-fr
fd.4.it	debian 12 / manpages-it
fd.4.ja	debian 12 / manpages-ja
fd.4.pl	debian 12 / manpages-pl
fd.4.pt_BR	debian 12 / manpages-pt-br
fd.4.ru	debian 12 / manpages-ru