Picture copied from Wikipedia entry:Black Obelisk
There's a sort of a six-pointed star on the "Black Obelisk" of Shalmaneser III (858-824 BC) discovered in Nimrud in northern Iraq. The obelisk had been erected in 825 BCE. It is the earliest ancient description of an Israelite. Archaeologist Sir Henry Layard discovered it in 1846.
There are twenty reliefs on this obelisk describing subdued kings. In one of them this six-pointed star is above King Jehu's head. The translation of the Assyrian caption above the scene is:
The tribute of Jehu, son of Omri: I received from him silver, gold, a golden bowl, a golden vase with pointed bottom, golden tumblers, golden buckets, tin, a staff for a king [and] spears.