systemd's logo is a green [OK] from the boot screen

Systemd is a suite of basic building blocks

systemd has unveiled its official brand identity, and the logo draws directly from the most recognizable moment of a Linux boot: the green [OK] that signals a service started successfully. Designed by Tobias Bernard of GNOME in 2019, the mark abstracts those brackets into a symbol of services running inside systemd. The brand also settles a long-standing question: it's systemd, lowercase, because it's a system daemon.