EXAMPLES FROM THE WEB FOR OMPHALOS
Omphalos, om′fal-us, n. the navel: a raised central point: a boss.
Delphi also contained the “Omphalos,” a sacred stone bound with fillets, supposed to mark the centre of the earth.
From which omphalos or hub of the universe he will direct his shining team even to the far Hesperides of Richmond or of Windsor.
Among the former is the famous Omphalos or Navel-stone, on which Apollo is often represented as sitting.
On the right, the god is seated on the omphalos, holding up his right hand.