power: possession of controlling influence
flux: the amount of radiant energy passing through a unit area
density: the ratio of the mass of a substance to the volume it occupies
in naming this site it was a toss up between PFD & variable frequency orchestra (VFO) the meaning here for PFD is about the movement of power from the few to the many, the movement of ideas from the dense to the density, the fluctuation of capital from the few to the masses.