mk II or mk III?


Im relatively new so, this may be a dumb question.  What gives with al the mk II & mk III stuff.  I see it various brands & an equally varied type of things.  Turntables, my new phono preamp & cartridges.  I’m pretty sure I saw an amp & some speakers Both for sale here.

I’ve googled & did a thread search here. I can’t find anything that makes something an “mk” let alone a II or III.

Unless... My Kryptonite?? Some of the stuff I see makes me weak in the knees, my head spins & I drool profusely.

I’m really curious.  Thanks for sharing your knowledge.
tochsii
You will also see V2 for "version 2" sometimes used, it means the same thing. 
It usually connotes an upgrade. MK-I, MK-2, MK-3.  For example, my current cartridge is an AudioTecnica MK-III.  Also used by some manufacturers is a "Special Edition" designation which marks an improvement. For example, Audio Research uses the "special edition" designation with the logo "SE."

Frank
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