'Cubits' in the Bible

Then Zeresh his wife and all his friends said, "Have a pole made 50 cubits high, and then in the morning speak to the king and have Mordecai hanged on it. Then go with the king to the banquet happy." This advice pleased Haman, and he had the pole made.

Then Harbonah, one of the eunuchs attending the king, observed, "Look there! A pole is standing 50 cubits high at Haman's house that he prepared for Mordecai, whose report benefitted the king!"