All three dojo I've trained in refer to this place/principle. Easiest common example of it as a location is where you optimally end up when entering behind the uke to prepare to do iriminage (or, if you are in a Ki Society dojo, kokyunage). As a principle, I like to think of it as "disappearing" in a way that you have connection with uke but for a moment uke really doesn't know where you are.
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