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The term Planck is in reference to a physical constant reflecting the minimum sizes of physical matter in quantum mechanics. It is named after Max Planck, one of the founders of quantum theory. In some theories or forms of quantum gravity, it is the length scale at which the structure of spacetime becomes dominated by quantum effects, giving it a discrete or foamy structure. It describes the 'graininess' of space time and gives a measurement to the immeasurable.