Package gnome-screensaver

GNOME Screensaver

gnome-screensaver is a screen saver and locker that aims to have
simple, sane, secure defaults and be well integrated with the desktop.

General Commands (Section 1)
GNOME Screensaver is the default screen saver and locker in a GNOME desktop. It is designed with simplicity and security in mind.
gnome-screensaver-command is a tool for controlling an already running instance of gnome-screensaver.