Multiplying in frequency domain is convolution, in DL terminology convolution is that convolution with the weights rotated by 180 degree.
Convolution of f and g at t is:
integration of f(x) * g(t - x)
Cross correlation(which is termed convolution in DL) at t is: integration of f(x) * g(t + x)
See the figure in the wikipedia page you shared.1 : a form or shape that is folded in curved or tortuous windings e.g the convolutions of the intestines
2 : one of the irregular ridges on the surface of the brain and especially of the cerebrum of higher mammals
3 : a complication or intricacy of form, design, or structure … societies in which the convolutions of power and the caprices of the powerful are ever-present dangers to survival.
After this is clear read the mathematical idea on wikipedia. After reading that, do google scholar search on the AI papers that first mentioned it. That is the way to go.