'Pillar' in the Bible

For, behold, I have made you this day a fortified city, and an iron pillar, and bronze walls, against the whole land, against the kings of Judah, against its princes, against its priests, and against the people of the land.

As for the pillars, the height of the one pillar was eighteen cubits; and a line of twelve cubits did compass it; and its thickness was four fingers: it was hollow.

A capital of brass was on it; and the height of the one capital was five cubits, with network and pomegranates on the capital all around, all of brass: and the second pillar also had like these, and pomegranates.