Girobicúpula pentagonal

In geometry, the pentagonal gyrus is one of Johnson's solids (J31). Like the pentagonal orthobicula (J30), it can be constructed by joining two pentagonal domes (J5) by their bases. The difference is that, in this solid, one of the halves is rotated 36 degrees relative to the other.

The pentagonal gyro is the third gyro gygote of an infinite set of them.

The pentagonal gyroscope is what you get when you take a rhombicosidodecahedron, remove the central parabensized rhombicosidodecahedron (J80), and glue the two domes back together.

Johnson's 92 solids were named and described by Norman Johnson in 1966.

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