"And on the pedestal, these words appear:"
Double Meaning: Ozymandias has commissioned an inscription on the supporting foundation of his statue, to strengthen his power, physically and verbally.
Conveys the vainglorious and conceited nature of Ozymandias himself, as he literally places himself on a pedestal, thus feeling superior and omnipotent.
This inflated sense of self and hubris foreshadows his tragic demise.