This house sign in Graz shows a bird standing on a combination of a star and a crescent. The combination star and crescent was already known in the Hellenistic period (4th–1st centuries BCE). The crescent represents the moon, the star represents the sun or the morning star. [German]
The crescent offers an interesting detail: it shows a face. Such a face you can sometimes see in coat of arms, as well.
Sources / More info
- Star and crescent (Wikipedia)
- travel-by-photos.com (Photo 1)