Verjüngungsverhältnis = thinning ratio.
Used in forestal managenent and something with gears that I cannot fathom: Polytechnisches Journal - Der Spannungszustand von Schwungrädern bei gleichförmiger Rotation.
In aerodynamics I'd expect it to describe either the angle or the square area of the trailing end of a Kamm body (but I'm no expert).
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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 0.2 Gigameter or 0.13 Megamile.
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