Nowadays, as a statement of the energy of a light quantum, often one finds the formula E = ħω, where ħ = ⁠ h / 2π ⁠, and ω = 2π ν denotes angular frequency, and less often the equivalent formula E = hν. This statement about a really existing and propagating light quantum, based on Einstein's, has a physical meaning different from that of Planck's above statement ϵ = hν about the abstract energy units to be distributed amongst his hypothetical resonant material oscillators.