An amphidromic point.
Amphidrome was also an ancient Greek naming ritual that took place on the 5th or the 7th day after an infant was born, and which involved a sacrifice. The naked father carried his newborn around the hearth so that the fire might purify the body, thus officially introducing the baby into the family and inscribing the infant within the space of the oikos.
All women involved would be ritually purificated. The friends and relatives sent traditional gifts, but would not attend unless they had been present at the birth.
The family would decorate the doorway of the house announcing the birth according to the gender: if it was a boy, with wreath of olive; if it was a girl, with wool.