Equiangular Spiral
Equiangular Spiral is a curve that grows wider while keeping the same angle at every turn, like a seashell.
Think of it this way
A cinnamon roll shows this shape. Each ring curves outward from the center, but the angle of the spiral stays the same at every point. The outer rings are wider, yet the turn is always the same gentle curve.
Explaining equiangular spiral by grade level
Look at a snail shell. It starts small in the middle. Each loop gets bigger as it goes out. The shape curls the same way every time it grows.