A cardioid is a type of geometrical shape that is a type of limacon. A cardioid is formed when a circle is rolled around another circle creating a curved shape.
A cardioid has 1 line of symmetry.
That means a heart curve.
heart
The cardioid or unidirectional microphone is the most common type of microphone pickup pattern. It is used everywhere, from voice to instruments.
A cardioid is a heart shaped circle with another circle thing going around it always meeting up at the middle of the circle thingy...I think?
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The cardioid can be found in the caustics of cups, the shape of a lily leaf, the shape of an apple seen from the side, the construction of unidirectional microphones and the central bulb of the Mandelbrot set.
Cardioid