The atomic/orbital symbol — electrons circling a nucleus — used literally for science content, but online it's become shorthand for "nerd," "science person," or ironically for anything vaguely intellectual-sounding. Interestingly this exact orbital design isn't scientifically accurate (real electron behavior is described by probability clouds, not neat orbits) — it's a simplified Bohr-model-style icon that stuck in pop culture.
Keywords: atheist, atom, symbol