Lately it has also acquired the meaning of determination and strength, and it´s a protection during sea voyages.
Requested by Nicole.
A curiosity: hei means "neck" and hei-matau is the name of fish hook shaped pendants. When wearing them on the skin, the contact alters their colour and it is said that this happens because the spirit of the owner infuses into it. Pendants that belonged to many valiant people acquire thus a great value and are highly considered.