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Sounds similar to the U.S.' old NC designation. We dropped the C, which I think designated a 'civil' aircraft and now use only the N plus numbers.

Don

Just for the record, From FAR 45.22

ii) The symbol appropriate to the airworthiness certificate of the aircraft (?C?, standard; ?R?, restricted; ?L?, limited; or ?X?, experimental) followed by the U.S. registration number of the aircraft; and

The N denotes a civil aircraft.

I think at one time way back in the past, the C actually stood for "commerical"

Mexico uses an "X" followed by either an "A", "B" or "C". The A being privately owned aircraft, the B being commerical aircraft, and the C being govermental aircraft.

Charles

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