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Legend :

The 1 or the first 3 letters symbolizes the nature of elastomer
NR = Naturel
CR = Chloroprene
NBR = Nitrile Butadiene
IIR = Isobutylene Propylene
FPM = Fluorocarones
CSM = Polyerhylene Chlorosulfone
SIL = Silicone 

The number is hardness in Shore:
40 = Flexible
60 = Standard hardness
90 = Very Hard

The letter indicates the color of the profile:
N=Noir
B=Blanc
G=Gris
M= Marron
R= Rouge
V= Vert

Examples: NR70N = Natural 70ShA Black ///CR80B = White Neoprene 80ShA