T seems readily apparent that the narrative of Nebuchadnezzar's dream in Daniel 2 is repeated and expanded in Daniel's dream here in Daniel 7. Nebuchadnezzar dreamed about a statue that represented the kingdoms of this world. Daniel dreamed about some animals that represented the same kingdoms of the world. Nebuchadnezzar's statue was comprised of metals that (at first) got increasingly hard but decreasingly valuable. There was gold for Babylon, silver for Persia, brass for Greece, iron for Rome and a mixture of clay and iron for the kingdom of the antichrist. Last of all, the kingdom of Christ was stone.
Now, in Daniel's dream he saw a winged lion (representing Babylon), a bear (representing Persia), a leopard (representing Greece) and an animal with 10 horns and iron teeth (representing Rome). Then he saw a little horn (representing the antichrist) grow up on the head of that fourth animal. Also, in his dream, he was given a vision of Ancient of days (God the Father), the Son of man (Jesus) and the saints.
Other prophetic metaphors that stand out in the text are as follows: the four winds (perhaps representing spiritual warfare), the great sea (representing the population of the whole world), a fiery stream before the throne of God (representing righteous judgment) and the books (representing God's perfect knowledge). You may be able to pick out several more.