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New Chilokver wrote:

all the names that are like oscar, hotel, alfa etc. are nato designations
russians went more for numerical designation
e.g. yankee was project 667? iirc

https://en.wikipedia.org/wiki/Yankee-class_submarine

if you look at this, especially the variants section, you get designations such as 'navaga', 'nalim' , 'grusha', 'andromeda' and 'akson' as class/subclass names