While there's no search result provided, it's common knowledge that scales, whether for measuring weight, temperature, or other quantities, typically have zero at the topmost part of the scale panel. This is because: - Starting Point: Zero represents the beginning point of measurement.- Reference Point: Zero serves as a reference point from which other values are measured.- Visual Clarity: Placing zero at the top makes it easier to read and interpret the scale. Therefore, the answer is "Zero".