What does mk stand for?
It's an abbreviation of "mark", meaning version or revision.
From Cambridge Dictionaries:
Mark (noun)
uk /mɑːk/ us /mɑːrk/
› used before a number to describe a particular version of a machine, especially one that is an improvement on the original version: The car has enjoyed modest success since its launch, but the Mark 2 version is expected to be far more popular.
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