Selecta ®
Selecta was an early Shimano ® attempt at a splined crank/bottom bracket system, dating from the late '70s or early '80s.
The spline pattern was chosen to premit the spindle to fit through a Front-Freewheel bearing set, which wouldn't permit a standard sized square tapered BB spindle to fit throgh the front freewheel bearing assembly.
These turned out to be rather unreliable, due to the small diameter of the splines, and Shimano abandoned the system. The did continue to supply spare parts for many years thereafter, but these are no longer available.
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