I can't find the name for this kind of hole. It allows the release of the plate by just loosening the bolt a bit, without having to remove it completely.
Searches using "teardrop" or "hole with oblong" do not return the desired results.
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I would call that a 'key hole'.
Aakash Sheth
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1Yup, everything I can find calls them "keyhole slots". – JMac Feb 01 '17 at 21:53