Each fruit is recognised by the fetters abandoned
The Discourse on Mindfulness of Breathing (MN 118) opens with the Buddha looking over the assembly of monks on a full-moon night and naming them by kind: some are arahants, their taints destroyed; some have abandoned the five lower fetters, will be reborn spontaneously and attain Nibbāna there, never returning to this world; some are once-returners; some are stream-enterers. According to the Discourse on Fetters (AN 10.13), the five lower fetters are identity view, doubt, clinging to rules and rituals, sensual desire and ill will; the five higher ones are desire for form, desire for the formless, conceit, restlessness and ignorance. The discourses measure a stage by what has been let go: peaceful feelings come and go, while an abandoned fetter is a change at the root of the mind.