Tricyclic saturated hydrocarbons, systematically named tricyclo[a.b.c.01,(a+2)]alkanes; have been referred to as [a.b.c]propellanes. Cf. paddlanes.
[4.1.1]propellane 
[4.4.4]propellane
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Tricyclic saturated hydrocarbons, systematically named tricyclo[a.b.c.01,(a+2)]alkanes; have been referred to as [a.b.c]propellanes. Cf. paddlanes.
[4.1.1]propellane [4.4.4]propellane