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)

4935. When made visible that bare arm is bent in varying attitudes that strike terror. When seen bent in the attitude mentioned above it strikes unbelievable terror, since it seems to be able to break bones and marrow to pieces instantaneously. Those who during their lifetime have been afraid of nothing are nevertheless in the next life driven by that arm to feel utterly terrified by it.