Ten

Once a person has had their aura nodes opened, they must learn to keep their aura from leaking away from their body. Ten (纏, Envelop?) is the process of keeping the nodes open, but also having aura flow through and around the body rather than away from it. Having a shroud of aura surround the body is the most basic defense against the physical or emotional attacks from other users of Nen. Ten also may reduce one's aging; since the energy powering the body is no longer leaking away, one can keep the body from breaking down, thus slowing the aging process.[1]