where is the format of --list-sigs explained?

[Miernik]

Where is the format of gpg --list-sigs explained? 

I cannot find it anywhere.

What doesn D, R and g mean (as in pub  1024D/ABC292D1)?

What do these flags mean:

sig 3   P  
sig 3  R   
sig 3   PN 
sig 3     X 

Can there be any other flags there?

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