Zeon was an inhabited planet. This planet had a ring system. It was the homeworld for the Zeons, a pre-warp humanoid species. This planet was further out from its primary than the sister planet Ekos.

By the mid-23rd century, Zeon had interplanetary capable ships and its civilization had enjoyed dozens of generations of peace. Zeons were being sent to Ekos on a mission of civilizing the Ekosians.

In 2268, Zeon was briefly endangered when the Ekosian Nazi regime planned to attack it with a fleet of manned and unmanned weapons. Promoted as the "Final Decision", the attack was barely averted by the crew of the starship USS Enterprise, working with the Zeon and native Ekosian anti-Nazi underground resistance. (TOS: "Patterns of Force")

The name Zeon is similar to "Zion", a Hebrew metonym for ancient Israel. The altruistic immigrants Isak, his brother Abrom, and Davod are also similar to Hebrew names.
According to, Ekos was located in the M34 Alpha system; however, according to the Star Trek Encyclopedia (4th ed., vol. 2, p. 513), the planet was located in the M43 Alpha system. Furthermore, it is stated in the Star Trek Encyclopedia that Zeon was a M-class planet.
According to the Star Trek Maps (p. 27) and The Worlds of the Federation (p. 122), the name of the system was M43-Alpha. It was a trinary system, Zeon being the fifth planet. According to Star Trek Maps, the total population of the two planets was 16.1 billion.

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