This ideogram is a graphic model of the
current theory of the organization of matter on the microcosmic
level. The point in the middle denotes the nucleus of the atom, and the
ovals indicate the orbital paths of the invisible
model is presented in an imagined three-dimensional space (suggested
by the asymmetry). The sign is a symbol for uranium, nuclear power, nuclear
Compare with , a sign from Ghana, Africa.
The signs and in Group 25 are synonymous and much more common.