What symbol indicates sky coverage in weather depiction charts?

In weather depiction charts, a circle is the symbol used to represent sky coverage. This symbol is crucial as it visually conveys information about the amount of clouds present in the sky. The representation includes various shading or filling within the circle to indicate different levels of cloud cover, such as overcast, scattered clouds, or clear conditions. This allows those interpreting the chart to quickly assess the sky's situation and make informed decisions regarding weather conditions, especially in aviation, where understanding visibility and potential weather impacts is essential.