Newbee: what does "Mk" stand for ?

"Jan Gelbrich" wrote in message
...

Hello, just as a non-native English speaker,
I would like to know what the abbreviation "Mk" stands for,

e.g. in "Supermarine Spitfire Mk I" or "~ Mk II" and so forth,
which can be found on many other British and American airframe types, too.
Is is "mark", "making" or what else ?


It's mark.