Man pages matching name bsd_signal in section 3:

bsd_signal.3.en	debian 10 / manpages-dev
bsd_signal.3.ja	debian 10 / manpages-ja-dev
bsd_signal.3.en	debian 11 / manpages-dev
bsd_signal.3.fr	debian 11 / manpages-fr-dev
bsd_signal.3.ja	debian 11 / manpages-ja-dev
bsd_signal.3.en	debian 12 / manpages-dev
bsd_signal.3.fr	debian 12 / manpages-fr-dev
bsd_signal.3.ja	debian 12 / manpages-ja-dev
bsd_signal.3.ru	debian 12 / manpages-ru-dev