Memory Alpha
Memory Alpha

Armus IX was the inhabited ninth planet in its star system. This planet was located somewhere in the Alpha or Beta Quadrant.

Prior to stardate 41636, William Riker had to wear a costume decorated with feathers here during a diplomatic conference. In 2364, Riker referenced this event in a conversation with Natasha Yar and Deanna Troi in his preparations for his meeting with Beata, the Elected One of Angel I, on the lengths to which he would go to meet local customs. (TNG: "Angel One")

This planet was only mentioned in dialogue.
There was some confusion about the spelling of this planet's name. At StarTrek.com, the planet's name was spelled Armis IX, whereas with the Star Trek Encyclopedia, 4th ed., vol. 1, p. 45, it was spelled as Armus IX. [1](X)

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