Battering Ram
People's Dictionary of the Bible [1]
Battering Ram. Ezekiel 4:2. The engines of Ezekiel 26:9 were most likely battering-rains, mentioned under the name of rams. Ezekiel 4:2; Ezekiel 21:22. Those used by the Assyrians appear to have consisted of a strong frame-work on wheels, so covered as to protect the soldiers working it, and armed with one, or sometimes two, pointed weapons. It differed considerably from the more familiarly known ram employed by the Romans. "Engines of shot" are mentioned in Jeremiah 6:6, marg., 32:24, marg.; Ezekiel 26:8, marg., but incorrectly.
Morrish Bible Dictionary [2]
The machine used anciently for knocking down gates or walls. A heavy beam was suspended by chains, at the end of which was an iron head, shaped something like a ram. The name (which in both passages is simply 'ram') may have been derived either from its shape, or from the resemblance of its action to the butting of a ram. It was pulled away from the wall and then swung heavily against it. Ezekiel 4:2; Ezekiel 21:22 .