Daniel 7:7

A fourth beast. — This is so different from the preceding three, and so terrible in appearance, that Daniel can hardly find words to describe it. The distinguishing feature of it is the power which it possesses of breaking and stamping out all that it meets. In this way it corresponds to “iron that breaketh in pieces, and subdueth all things.” (Comp. Daniel 2:40.) The description of the destructive might of this beast is heightened by the mention of “iron teeth” and “brazen claws.” It should be noticed that the horns imply strength, while the ten horns correspond to the ten toes of the image.

The residue — i.e., what it did not destroy with its teeth it trampled upon and annihilated with its feet.