A daemon or other system process (syslogd) A domain name (example.com) An ethernet address (00:05:4E:49:FD:8E) An event of some sort (SIGHUP) An event handler of some sort (hangup) A filesystem (ext3) A fully qualified domain name (my.example.com) A group name (wheel) An IP address (127.0.0.1) A library (libncurses) A macro A netmask (255.255.255.192) A newsgroup (comp.text.xml) An operating system name (Hurd) A process (gnome-cups-icon) A protocol (ftp) A resource A security context (a role, permission, or security token, for example) A server (mail.example.com) A service (ppp) A system name (hephaistos) A user name (ndw) Indicates that the system item is some 'other' kind. Indicates that the system item is some 'other' kind.