weather-symbol

from The Century Dictionary.

• noun A conventional sign used in meteorological records, or in published meteorological observations or weather-maps, to represent graphically any designated phenomenon. The following symbols have been adopted by the International Meteorological Congress to represent the principal hydrometeors and a few other phenomena. Rain, ; snow, ; thunderstorm, ; lightning, ; hail, ; mist, ; frost, ; dew, ; snowdrift, ; high wind, ; solar corona, ; solar halo, ; lunar corona, ; lunar halo, ; rainbow, ; aurora, ; haze, dust haze, ∞.