What do the three bars under the cloud represent?

The three bars below the cloud represent fog.

In weather icons, common symbols are sunny (eye), cloudy, cloudy, foggy, light rain, moderate rain, heavy rain, rainstorm, thunderstorm, hail, freezing rain, light snow, blizzard and medium snow. When there are three short horizontal lines under the cloud, it means foggy weather. This symbol is used to indicate that the high concentration of water vapor in the air leads to reduced visibility, blurred vision or slight fog.