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wind 
Displacement of air caused by variations in pressure between two regions of the atmosphere.
pennant
Symbol of a wind blowing between 88 and 96 km/h.
barb
Symbol of a wind blowing between 14 and 22 km/h.
half barb
Symbol of a wind blowing between 5 and 13 km/h.
shaft
Symbol of a wind blowing at a speed lower than 5 km/h.
wind arrow
Symbol that uses the position of the shaft to indicate wind direction and the number of barbs and pennants to indicate wind speed.
calm
Symbol indicating the absence of wind.
