'Symbol' in the Bible

Then he said to me, “This [continuous supply of oil] is the word of the Lord to Zerubbabel [prince of Judah], saying, ‘Not by might, nor by power, but by My Spirit [of whom the oil is a symbol],’ says the Lord of hosts.

And I said, “What is it?” And he said, “This is the ephah (grain basket) going forth. This,” he continued, “is their appearance throughout the land

And he said to me, “To the land of Shinar (Babylon) to build a temple for her; and when it is prepared, she shall be set there on her own pedestal.”