Symmetrical.
A symmetrical shape is simply one that when cut, or folded, in half, the one half can reflect the other half. So, each half looks the same, but as a mirrored reflection of the other.
On the other hand, something that is of irregular shape - which is not symmetrical in that when cut into halves in any plane at all, the pieces are not a mirror reflection of one another - is referred to as "asymmetrical".
A dome house is of symmetrical shape.
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