Well, maybe...
- a big 'Sigma' sign (sum)
- something remembering to formulas, something simple, a^b, e = mc^2, x/y, a(over)b, sqrt(a), ...
Not easy, true.

Hah! What about an abstracted 'Einstein' photo...? (not sure if the example will be stripped)...



scaled to 32x27:



--
ALG

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