What is the sign that looks like a beard in the weather forecast?

Represents floating dust, but it is not a standard symbol. The standard floating dust icon is "S".

Weather forecast symbols are special symbols representing various weather phenomena, clouds and sky conditions. Includes weather phenomenon symbols for observation and recording and weather graphic symbols for media communication.

Frost will appear in autumn, winter and spring. Frost refers to the sudden drop of temperature, and the surface temperature drops below 0℃, causing damage to crops and even death. It's different from frost. Frost is a white ice crystal that condenses directly on objects when the water vapor in the air near the ground reaches saturation and the ground temperature is lower than 0℃. When there is frost, it is not necessarily frost.

Frost is generally divided into three types. Frost caused by the invasion of strong cold air in the north is common in early spring and late autumn in the north of the Yangtze River, as well as in winter in South China and Southwest China. Northerners call it "wind frost" and meteorology "advection frost". On a clear and windless night, due to strong radiation and heat dissipation, the ground appears low temperature, which is called "clear frost" or "static frost" by the masses and "radiation frost" in meteorology.