They are units defined by coordinate system & projection of map (see AxMap.GeoProjection.ExportToWkt()), which in turn is usually borrowed from the first datasource which is added to the map. If it's WGS84, they are degrees. For UTM or Web Mercator they are meters. In your case they are most likely meters. It's rather uncommon to see units other than decimal degrees or meters.
The important thing is that these coordinates are projected, which means that because of the distortions introduced by projection they often aren't equal to the units on the ground. If you are using correct UTM zone they will be close to the reality, but Web Mercator, for example, introduce larger distortions the further from the equator you go. Therefore for correct calculations of distance and area it's recommended to use AxMap.GeodesicDistance, AxMap.GeodesicArea.
Hope it helps,
Sergei
The important thing is that these coordinates are projected, which means that because of the distortions introduced by projection they often aren't equal to the units on the ground. If you are using correct UTM zone they will be close to the reality, but Web Mercator, for example, introduce larger distortions the further from the equator you go. Therefore for correct calculations of distance and area it's recommended to use AxMap.GeodesicDistance, AxMap.GeodesicArea.
Hope it helps,
Sergei
