The first official currency of Brazil was the real (pl. réis). Its sign was Rs$. As the currency of the Portuguese empire it was in use in Brazil from the earliest days of the colonial period, and remained in use until 1942, when it was replaced by the cruzeiro.
The name real was resurrected in 1994 for the new currency unit (but with the new plural form reais). This currency is still in use. One modern real is equivalent to 2.75 × 1018 (2.75 quintillion) of the old réis.