The superimposed ellipses represent the atom symbol. Stylized representation of an atom: electrons orbit the atomic nucleus. An atom is the smallest part of an element. Refers to something very small, or to nuclear power, nuclear deals, or science.
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Emoji History
Development of the emoji in the Unicode lexicon
First included
The emoji “Atom symbol” was approved as part of Unicode 8.0 in 2015 and added to Emoji 1.0.