Wikipedia uses clipping point as a synonym for apex.
So the apex is the point where the racing line hits (clips) the inner boundary of the track. It has nothing to do with the point where the turning radius is smallest, whether such a point were easy to determine or not.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
 lifetime FE over 0.17 Gmeter or 0.1 Mmile.
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