Main morphological grain shape classes - (From IACS - International classification for seasonal snow on the ground, 2009)

Main grain shape classes are classified by using either a symbol or a unique twoletter upper case abbreviation code. Subclasses are classified either by using the proper symbol or a four-letter abbreviation code, where two lower case letters are appended to the main class code. This abbreviation code will be useful for electronic data exchange formats while colours may be used for continuous representations in either space or time, e.g., in outputs of snowpack models

Class	Symbol	Code
Precipitation Particles	a	PP
Machine made snow	b	MM
Decomposing and Fragmented precipitation particles	c	DF
Rounded Grains	d	RG
Faceted Crystals	e	FC
Depth Hoar	f	DH
Surface Hoar	g	SH
Melt Forms	h	MF
Ice Formations	i	IF