The ones that I know about are these:
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#RequireAdmin
#NoTrayIcon
#SingleInstance Force ; this has other parameters but I can't find what they are at the moment.
#include <MsgBoxConstants.au3>
#include-once
#OnAutoItStartRegister
#pragma
There are also these for comments, but the point is to separate comments from preprocessors:
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#comments-start
#comments-end
#cs
#ce