'Pillar' in the Bible

Then his wife Zeresh and all his friends said to him, Let a pillar, fifty cubits high, be made ready for hanging him, and in the morning get the king to give orders for the hanging of Mordecai: then you will be able to go to the feast with the king with a glad heart. And Haman was pleased with the suggestion, and he had the pillar made.

Then the king said, Who is in the outer room? Now Haman had come into the outer room to get the king's authority for the hanging of Mordecai on the pillar which he had made ready for him.

Then Harbonah, one of the unsexed servants waiting before the king, said, See, the pillar fifty cubits high, which Haman made for Mordecai, who said a good word for the king, is still in its place in Haman's house. Then the king said, Put him to death by hanging him on it.

So Haman was put to death by hanging him on the pillar he had made for Mordecai. Then the king's wrath became less.