According to Daniel, the ram he saw by the river had two big horns, like a goat's horns, but one horn was taller than the other and grew later. Christians often understand this ram as a symbol of strong leaders or kingdoms, showing that one is mightier than the other.
Daniel 8:3: Then I lifted up mine eyes, and saw, and, behold, there stood before the river a ram which had [two] horns: and the [two] horns [were] high; but one [was] higher than the other, and the higher came up last. [the other: Heb. the second]
It speaks of God's purpose against Babylon, whereas Daniel 8:3 refers to the ram as the kings of Media and Persia, not Babylon.
Jeremiah 51:11: Make bright the arrows; gather the shields: the LORD hath raised up the spirit of the kings of the Medes: for his device [is] against Babylon, to destroy it; because it [is] the vengeance of the LORD, the vengeance of his temple. [bright: Heb. pure]