Originally seen as a bearded penguin (a reference to Tux, the penguin mascot of the Linux kernel), an image of a girl with a helmet and flippers was chosen as a human alternative. Her helmet (most likely a metaphor for the Linux kernel's oft-claimed excellent security) usually has horns on it, likely a reference to the GNU software which comprises the common system programs present in nearly all Linux distributions. The gear teeth on the helmet are a reference to KDE, a common desktop environment used with GNU/Linux. The foot symbol on her shirt is a reference to GNOME, another common desktop environment. She is often seen with a spear that has flags attached representing the GRUB, LILO and GCC tools for Linux.