Religious Stone Artifact, 'navel' in Ancient Greek

This page is the CodyCross answer for the clue below from Australia, Group 1010, Puzzle 3 (Kati Thanda Lake Eyre).

Question is: Religious Stone Artifact, 'navel' in Ancient Greek

and the answer is: OMPHALOS

Word Meaning:

OMPHALOS — An ancient religious stone artifact, or baetylus, used to denote the direction of the "center" of the world.

Definitions from Wiktionary.