The term 'Believer in Jah, informally' can be summarized as a Rasta, which is a five-letter word. Rastafari is an Abrahamic religion that originated in Jamaica in the 1930s. It is based on a spiritual connection with Jah (God) and the African diaspora. Rastafarians are known for their dreadlocks, reggae music, and use of marijuana as a sacrament. They are also known for their strong belief in social justice and equality.