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Pi icon

<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="9" x2="9" y1="4" y2="20"/><path d="M4 7c0-1.7 1.3-3 3-3h13"/><path d="M18 20c-1.7 0-3-1.3-3-3V4"/></svg>

Pi in other icon sets