Dayos IV was the inhabited fourth planet of its star system.

In 2363, the planet was the home of a former wife to the Albino when she was discovered by Kang. She was still deathly afraid of her ex-husband and refused to reveal his whereabouts to the vengeful Klingon. In 2370, she died, but not before dispatching her amulet to Kang disclosing the location of the Albino's sanctuary in the Secarus system. (DS9: "Blood Oath")

Miles O'Brien's Starfleet Intelligence created alias of Connelly, a down on his luck fix-it man, got two years for dealing in stolen goods on the planet. Liam Bilby sympathized with "Connelly" while discussing his past, and regarded the incident as a "tough break." (DS9: "Honor Among Thieves")

This planet was only mentioned in dialogue.
"DA-yos" was the pronunciation for this planet's name from the script pronunciation guide for "Blood Oath".
According to Star Trek: Star Charts (p. 64) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Dayos system was located in the Beta Quadrant. The primary was a G-class star.

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