I've read that "The Planck length is believed to be the shortest meaningful length (...)"(1).
Regardless of the factual accuracy of this claim, I'm wondering if: is there a related concept regarding energy? Or maybe even something less controversial, like a "quantum" of energy?
P.S. I have seen "Is the Planck length the smallest length that exists in the universe or is it the smallest length that can be observed?" and related questions/answers.