In the oracle concerning Damascus (Syria), Isaiah uses illustrations of the gleaning of grain and olives –plants common in that time.
Gleanings will be left in it, as when an olive tree is beaten– two or three berries in the top of the highest bough, four or five on the branches of a fruit tree, declares the LORD God of Israel. (Isaiah 17:6 ESV)
We could probably shake off several more of the olives from the limbs below and have a better illustration of what Isaiah says, but hopefully this will serve to illustrate the point.
Another thing Isaiah says is that Damascus would no longer look to the altars they had made with their own hands. These images, and the gods they represented, would fail.
He will not look to the altars, the work of his hands, and he will not look on what his own fingers have made, either the Asherim or the altars of incense. (Isaiah 17:8 ESV)
Altars of incense came in all sizes in those days, and many have been uncovered by archaeologists working at various sites. The altar below, now displayed in the Israel Museum, is from Megiddo.