The shape of something rotating; a vortex.
One 360° turn in a spring or similar helix.
A mathematical operation on two functions that produces a third that expresses how the shape of one is modified by the other; the integral of the product of the two functions after one is reflected about the y-axis and shifted along the x-axis.
Any of the folds on the surface of the brain.
A twist or fold.
The state or condition of being convoluted.
A function which maps a tuple of sequences into a sequence of tuples.
A shaft, held by a bearing, at each end or side of a rotatable object.
A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool.
A similar rotational bearing used in automotive suspensions.
One of the short stubby bearings on either side of a cannon; a gudgeon.