Translations:Xorg/Guide/45/en
From Gentoo Wiki
Note
The x11-base/xorg-x11 meta-package could be installed instead of the more lightweight x11-base/xorg-server. Functionally x11-base/xorg-x11 and x11-base/xorg-server are the same, however x11-base/xorg-x11 brings in many more packages that most systems will probably not require. Additional packages include a large assortment of fonts in many languages. They are not necessary for a working X11 framework.
The x11-base/xorg-x11 meta-package could be installed instead of the more lightweight x11-base/xorg-server. Functionally x11-base/xorg-x11 and x11-base/xorg-server are the same, however x11-base/xorg-x11 brings in many more packages that most systems will probably not require. Additional packages include a large assortment of fonts in many languages. They are not necessary for a working X11 framework.