A 'stretched out arm,' as in Exodus 6:6, signifies omnipotence or divine power, because 'an arm,' when stretched out in the heavens, represents power from the divine, but when not stretched out, but bended, it represents power in the general sense. This is why divine power is often shown in the Word as a stretched out arm or a strong hand.

(सन्दर्भ: Arcana Coelestia 7205)

4932. The ones who in the Grand Man correspond to the hands and arms, and also the shoulders, are those with power received through the truth of faith grounded in good. For those who have received the truth of faith grounded in good have received power from the Lord. They attribute all their power to Him and none to themselves; and the more they attribute no power to themselves, doing so not with their lips but in their hearts, the greater power they have. This is why angels are called powers and authorities.