What are the nuts of the water of heaven in things fall apart?

In "Things Fall Apart" by Chinua Achebe, the phrase "the nuts of the water of heaven" refers to the kola nut, a symbol of hospitality and friendship in Igbo culture. It is offered as a gesture of goodwill and respect when welcoming guests or during important ceremonies. The kola nut plays a significant role in social interactions and rituals in the novel.