Multiple realities(covers information from several alternate timelines)
Tsugh Kaidnn was a location.
In 2367, Tsugh Kaidnn's position was labeled on a tactical situation monitor in Captain Benjamin Maxwell's ready room on the USS Phoenix. (TNG: "The Wounded", okudagram)
In 2366, in an alternate timeline, during the Federation-Klingon War, Tsugh Kaidnn's position was labeled on a tactical situation monitor in the ready room aboard the USS Enterprise-D. (TNG: "Yesterday's Enterprise", okudagram)
This location was only mentioned in writing.
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