How did humans use the wao akua?

The "wao akua" is a term that doesn't seem to be a recognized or widely known object or concept. It's possible there's a misunderstanding or a typo.

Could you please provide more context or clarify what you mean by "wao akua"? For example:

* Where did you encounter this term? (e.g., a book, website, conversation)

* What is the approximate time period or culture associated with this term?

* What is your understanding of what "wao akua" might be?

Once I have more information, I can try to understand what you're asking and provide a helpful response.