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Sigma icon

<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" fill="currentColor"><path d="M24 5 7 5 7 7.414 15.586 16 7 24.586 7 27 24 27 24 25 9.414 25 18.414 16 9.414 7 24 7 24 5z"/></svg>

Sigma in other icon sets