A freezing level at the surface on a prog chart is depicted by what symbol?

A freezing level at the surface on a prog chart is depicted by a zigzag line. This symbol represents the altitude at which the temperature drops to the freezing point, indicating potentially hazardous conditions such as the presence of ice or frost on aircraft. Understanding this is crucial for pilots, as flying through areas with freezing temperatures can lead to ice accumulation on the aircraft, affecting its performance and safety. The zigzag pattern is specifically used to denote this freezing level, making it easily identifiable on a weather chart. Recognizing this symbol helps pilots make informed decisions about flight safety and weather conditions.