By A Mystery Man Writer
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⊅ not a superset of (U+2285) @ Graphemica
c - what is the meaning of == sign? - Stack Overflow
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DOUBLE-STRUCK N-ARY SUMMATION
⊙ circled dot operator (U+2299) @ Graphemica
DELTA EQUAL TO
☡ caution sign (U+2621) @ Graphemica
꯹ - ꯋꯤꯀꯤꯄꯦꯗꯤꯌꯥ