What does NCC mean in Star Trek?

Answer 1

It has not meaning at all. The question was asked of Gene Roddenberry, the creator of Star Trek's and he stated that NCC had no special meaning.

A different option is "Naval Construction Contract'

Answer 2

It has never been canonically established what the letters stand for, but in the 23rd and 24th centuries, "NX" (not to be confused with NX class) was used to designate experimental or prototype starships (which were not commissioned as part of the actual fleet) while NCC designated commissioned vessels. As to what the letters actually meant, we can only speculate; I personally think they're for non-English terms - perhaps Roman, Greek, or even Vulcan. But that's just my guess

Answer 3

It was fabricated for the show and doesn't technically represent anything at all:

http://en.wikipedia.org/wiki/NCC_%28Star_Trek%29#NCC

Answer 4

"N" first letter refers to an aircraft registered in the USA. The "C" second letter refers to a civil aircraft. They added a second "C", just because they thought it looked better.