Tight spiral

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Possible Answers:

COIL.

Last seen on: USA Today Crossword Answers – Oct 4 2022

Random information on the term “COIL”:

A helix (/ˈhiːlɪks/) is a shape like a corkscrew or spiral staircase. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, “twisted, curved”. A “filled-in” helix – for example, a “spiral” (helical) ramp – is a surface called helicoid.

The pitch of a helix is the height of one complete helix turn, measured parallel to the axis of the helix.

A double helix consists of two (typically congruent) helices with the same axis, differing by a translation along the axis.

A circular helix (i.e. one with constant radius) has constant band curvature and constant torsion.

A conic helix, also known as a conic spiral, may be defined as a spiral on a conic surface, with the distance to the apex an exponential function of the angle indicating direction from the axis.

COIL on Wikipedia