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If I tell you the S stands for Stainless Steel, I bet you will say I knew that!
S31600
From there you have 316 SS just like the AISI 316 which equates to a lot of other Societys like ASME SA182, ASTM A167 and AMS 5507.
N is for Nickel Alloys
N06625 recognize the 625 as in INCo 625
L is for Low melting metals and Alloys
K is Miscellaneous Steels and Ferrous Alloys
H is AISI and ASE H-Steels
J is Cast Steels except Tool steels
G is AISI and ASE Carbon and Alloy Steels
E = Rare Earth
C= Copper and its Alloys
A= I bet you figured this one out already (Aluminum in case some else who didnt know is reading)
F= Bet you knew that ones for Cast Iron already
P for Gold and ohter Precious metals
Z for Zink and Alloys
T for Tool steels
W for welding rod
R is Reactive and Refractory metals and Alloys
I dont think I missed any, Hope this helps