trapped inside, and two potassium atoms adhering to the outside."

The choice of the symbol has been explained by the authors as being concise, readily printed and transmitted electronically (the at sign is included in ASCII, which most modern character encoding schemes are based on), and the visual aspects suggesting the structure of an endohedral fullerene.

Endohedral metallofullerenes

Doping fullerenes with electropositive metals takes place in a 1 kV direct current

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