Known are the identification documents such as the DNI in which they have us registered with a certain number and our data. Well, for Linux we also have it.
Here I bring you some ID Cards from different distros: Arch, Fedora, SuSE, Gentoo, Debian and Mandriva.
In each one of them there is a small instruction manual that tells us the type of font that we have to use and the size of the avatar.
We can download them from here.
Source: Fedoring