 Letters written by Baháʼu'lláh to various individuals, including some heads of state, have been collected and assembled into a canon of Baháʼí scripture, including works by his son ʻAbdu'l-Bahá, and the Báb, who is regarded as Baháʼu'lláh's forerunner.Prominent among Baháʼí literature are the "Kitáb-i-Aqdas", "Kitáb-i-Íqán", "Some Answered Questions", and "The Dawn-Breakers".In English-language use, the word "Baháʼí " is used either as an adjective to refer to the Baháʼí Faith or as a term for a follower of Baháʼu'lláh.