Andor is a location, likely a planet.
Lisa Cusak once worked at the Federation Embassy on Andor. (DS9: "The Sound of Her Voice")
In 2373, Kai Winn Adami rhetorically asked Captain Benjamin Sisko if the Federation would sacrifice Andor to protect Bajor from the Dominion. (DS9: "In the Cards")
One of Worf's suggestions for his honeymoon with Jadzia was a mountain climbing expedition on Andor. (DS9: "Change of Heart")
With the fall of Betazed to the Dominion during the war, many people believed Andor could be threatened. (DS9: "In the Pale Moonlight")
- Andor was mentioned as a small note on a very large star chart graphic created for TNG: "Conspiracy." It was the image behind the chair in the room where Dexter Remmick was killed. A TNG: "Yesterday's Enterprise" graphic also listed Andor, in an alternate timeline, on a tactical situation monitor showing progress of the Klingons in their war with the Federation.
Viewscreens on Deep Space 9's promenade and replimat advertised trips to "sunny Bajor" and "scenic Andor" which would not take much time thanks to the "latest Warp drive powered starships. (DS9: "What You Leave Behind")
Background
According to writers Judith and Garfield Reeves-Stevens, in a special features segment in ENT Season 4 DVD, the establishment of the Andorian homeworld as a moon orbiting a gas giant was devised to help explain the contradiction of why it was sometimes called Andor and sometimes it was called Andoria. They explained that is could be both and that they had hoped to establish the gas giant as Andor and the moon as Andoria. However, the references an embassy and mountain climbing make its being a gas giant unlikely.