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x is the X Window system protocol, x11 its current major release (since the late 80s), and xorg a specific implementation (as opposed to e.g. xfree86). See e.g. here. While there's probably no practical difference between x and x11, there is one between spec and implementation.
xis the X Window system protocol,x11its current major release (since the late 80s), andxorga specific implementation (as opposed to e.g. xfree86). See e.g. here. While there's probably no practical difference betweenxandx11, there is one between spec and implementation.