Notification under section 10(23C)(iv) designates Vivekananda Nidhi as a notified institution for tax exemption purposes. Notification under section 10(23C)(iv) of the Income-tax Act, 1961 designates Vivekananda Nidhi, Calcutta as a notified institution; the Central Government issued S.O.3107 dated 27-6-1989 to notify the entity for assessment years 1987-88 to 1989-90, thereby recognising it within the statutory framework of clause (23C)(iv).