spiraalit
Spiraalit is the Finnish plural for spiraali, the term used throughout science, mathematics, art and everyday language to denote helically shaped curves or structures that roll around a central axis. In Euclidean geometry a spiraali is typically defined by a continuous curve that winds around a point or line, never crossing itself, and can be described analytically by polar equations r = aθ or in parametric form x = r cosθ, y = r sinθ. Classic examples include the Archimedean spiral, the logarithmic (equiangular) spiral, and the Fermat spiral.
In biology spiraalit are omnipresent. The shells of many gastropods, the horns of some mammals, the microstructures
The term spiraalit also appears in cultural contexts. In Finnish folklore, spiraalit are sometimes associated with
In physics and engineering spiraalit play crucial roles. Helical coils in transformers and inductors are practical