'Arm' in the Bible

Wherefore say unto the children of Israel, I am Jehovah, and I will bring you out from under the burdens of the Egyptians, and I will rid you out of their bondage, and I will redeem you with an outstretched arm, and with great judgments:

Terror and dread falleth upon them; By the greatness of thine arm they are as still as a stone; Till thy people pass over, O Jehovah, Till the people pass over that thou hast purchased.