Daniel unravels the mystery of the great metal statue, explaining to the king that his vast empire is not merely a political triumph, but an unprecedented divine gift. God has granted him absolute authority over every corner of creation inhabited by humans, wild animals, and birds [אבן עזרא, ביאור שטיינזלץ]. This dominion over all living creatures is total and entirely unique [יוסף אבן יחיא, מצודת דוד]. His rule is so absolute that he could command a horse not to neigh or a bird not to fly [רש״י]. Such immense power is vividly illustrated by the tradition that he would ride a lion while wearing a snake tied around his head [מצודת דוד, חומת אנך].
In the dream, the king is represented by the statue's head of gold. This imagery carries several layers of meaning. As the head, his kingdom is the first in both time and rank [מצודת דוד], standing exceptionally strong, established, and prominent [רש״י]. The image also functions as a biological parallel. Just as a head provides intellect to a human body and directs the senses and movements of animals, the king guides and controls all these living creatures [מלבי״ם]. Furthermore, the head symbolizes three defining characteristics of the king: his intellect, his physical strength, and his majestic glory [אלשיך]. The specific choice of gold reflects his universal reach. Just as gold is valued wherever people live, his rule spans across all these regions, elevating his kingdom far above all others [אלשיך].
Crucially, this global dominion was granted to the king personally, rather than to his nation as a whole. This unique privilege came as a direct reward from God. Years earlier, the king took three steps to protest a slight against God's honor, ensuring God was properly respected in a letter sent to King Hezekiah. Because of this specific act of reverence, he personally merited such unmatched authority and earned his place as the head of gold [אלשיך].