Kronos
Kronos is the name of the
Klingon homeworld. In Klingon it is spelled
Qo'noS.
roD 'oHvaD juHqo' ponglu' neH
It is usually referred to as simply "The Homeworld."
(
SkyBox Card #27)
History
Up until
Star Trek VI: The Undiscovered Country, the homeworld's name had not been established by any
canon sources. The word "Kronos" first appeared in the script for ST6. It was not Marc Okrand who made that word up.
John Ford's novel
The Final Reflection dubbed it
"Klinzhai", though that was never used on screen. An offhand mention of "Kling" in
Heart of Glory, an early episode of
Star Trek: The Next Generation, was apparently intended to refer to the Klingon homeworld, but the writers realized how silly it sounded. According to the
Bird of Prey poster (BOP), Kling is merely the name of a district of the First City.
Klingon spelling

The Klingon spelling
Qo'noS first appeared after
Star Trek VI: The Undiscovered Country in the
addendum of
TKD (p. 184). That spelling also appeared in the English texts of the
SkyBox Cards. The word has never been used on screen until
Star Trek Into Darkness, where it was visible on screen (literally a monitor in the movie), using all major case letters QO'NOS. Later in the movie, the name KRONOS was shown only for the viewers of the movie, which led to a discussion among Star Trek fans, whether the Klingon or latinized spelling is the canon one.
Actually, the Klingon spelling should not be considered (Star Trek) canon, because the writing we know is only considered a description of the sounds. The Federation standard (i.e. English) spelling for the Klingon homeworld IS "Kronos", as it has been used in all movie and episode scripts between 1991 and 2013 (the script of ST12 has not been confirmed).
Known regions on Kronos
References
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:
External links