KDE - What is 'Meta'?

I want to enable keyboard shortcuts for moving windows from screen to
screen. (monitor to monitor on the same desktop) When searching around
on the web I see people doing it with Meta+F1, Meta+F2, etc., but
somehow I am not discovering what Meta is.

What's 'Meta'?

Also, in a related way, is there a way to have KDE always place apps
on Screen 1 and then I move them vs having a new app show up on the
screen that has the most recent focus?

Thanks,
Mark
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