HPE SKU Naming Convention

[MGische]

I kind of have a hard time understanding the nomenclature HPE is using with their product SKUs.
I can't seem to find any current information about the naming convention HPE/Aruba uses for their SKU-suffixes like B21, A21, 421, 001, 003 etc mentioned in the quick specs and technical documents.

What I found so far (according to this forum post 
001 = Spare Part/Hardware
002 = UPS

Does anyone have a document what they (currently) mean?
Example SKU Suffixes I am especially interested in:

• A21
• B21
• 421
• 001

[support_s]

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[MGische]

Not really a networking/Aruba question...