Symbol for a snow particle made up of many small crystals grown together in a random way (National Research Council of Canada)
Own work
Schaefer, V. J., Klein, G. J. &amp; de Quervain, M. R. (1954) The International Classification for Snow — with Special Reference to Snow on the Ground. Technical Memorandum No. 31. Associate Committee on Soil and Snow Mechanics. National Research Council of Canada, Ottawa, ON, Canada, pp. 1–2.
Carnby