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parallel
being everywhere equidistant and not intersecting
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regular
in accordance with fixed order or procedure or principle
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bilateral, bilaterally symmetric, bilaterally symmetrical, isobilateral
having identical parts on each side of an axis
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biradial
showing both bilateral and radial symmetry
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cruciate, cruciform
shaped like a cross
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even, regular
symmetrically arranged
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interchangeable
(mathematics, logic) such that the arguments or roles can be interchanged
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isosceles
(of a triangle) having two sides of equal length
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radial, radiate, stellate
arranged like rays or radii; radiating from a common center
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centrosymmetric, radially symmetrical
having a symmetrical arrangement of radiating parts about a central point
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rhombohedral, trigonal
having threefold symmetry