This is the whole section 7 of the manpages of some unspecified systemd/linux distro. Not to be confused with the kernels man-pages project[1].<p>[1] <a href="https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man7" rel="nofollow noreferrer">https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/...</a>