History, Traditions, and Terminology

Although I think I know my fair share about the history, traditions and terminology associated with our hobby or life style. I also know I don't know the half of it! This is open to everyone to share any history, traditions or terminology you know, or ask questions so we can all learn from eachother.
I will start it out with something I've been wondering for a while now.

On traditional built lake racers or lake racers back in the day, what did the number followed by a letter mean? ie. In the Duece of Spades, the Duece has 32c on the side. I figure the 32 is the year but what does the letter signify?
Thanks guys

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