さんげ is usu. used in Buddhism and ざんげ in other religions

repentance; confession; penitence

(a) confessional

Buddhism

penitence by chanting sutras; confession (of sins); Tendai ritual of chanting Lotus Sutra or to Kanzeon, Amida, or Kichijoten for forgiveness of sins performed unknowingly

Noun, used as a suffix; Buddhism

penitence sutra

Buddhism

guidebook to penitence

Historical term

national confession of Japanese war guilt (1945)

Work of art, literature, music, etc. name

Confessiones (St. Augustine of Hippo)

Work of art, literature, music, etc. name

Les Confessions (Rousseau)