A mathematical surface that looks like a spiral staircase—something shaped like a helix or spiral.
From helix (spiral) + -oid (resembling). Greek roots combined to describe anything that resembles or takes the form of a helix.
A helicoid is one of only two minimal surfaces that also rotate around an axis—mathematicians find it beautiful because it solves multiple geometric problems simultaneously, and nature uses this shape in snail shells and plant tendrils.
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