"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 ?


Mk = Mark, as in version, example: "Mk I eyeball." Some countries
(Russia, in particular) use the term "bis" to indicate a follow-on,
improved version of a type. For example, the Soviet SST Tu-144bis had
small retractable canards just aft of the cockpit.