plural of spiral nebula

(geometry) A self-similar spiral curve which often appears in nature.

(geometry) A logarithmic spiral whose growth factor is φ, the golden ratio.

(geometry) An approximation of the golden spiral created by drawing circular arcs connecting the opposite corners of squares in a Fibonacci tiling; a spiral formed by connecting quarter-circles whose radii are Fibonacci number multiples of the initial radius.

The nematode Synhimantus spiralis / Wad hook

(mathematics) A graphical depiction of the set of prime numbers, constructed by writing the positive integers in a square spiral and specially marking the primes.

Either of a pair of spirally wound conductors with metal balls at their ends. Placing one above the other forms an induction coil.

Synonym of Riess spiral

The situation in which members of an ideological group become increasingly zealous and intolerant, eventually turning on other members.

(economics) A pattern of economic inflation in which higher wages lead to higher prices, which lead to higher wages, and so on.