Atomic heraldry
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Atomic heraldry is heraldry characterised by the appearance of charges including the atom or showing the motion of parts of the atom; more loosely, it may describe heraldry in which atoms or the component parts thereof are represented through a combination of other charges. Obviously, this is a late development in heraldry.
The arms of Saint-Vulbas, Ain, France show "a sign of" the atom.
The arms of George Georgiou contain a representation of an atom with four electrons Sable in orbits Gules.[1]
There is an instance of a methane molecule in the arms of Hoerskool Secunda.[2]