The Brunei dollar, is the currency of Brunei Darussalam since 1967. It is normally abbreviated with the dollar sign $, or alternatively B$ to distinguish it from other dollar-denominated currencies. The currency is divided into 100 cents and is issued by the Brunei Darussalam Central Bank.
Under the Currency Interchangeability Agreement in 1967, the Brunei dollar is interchangeable with the Singapore dollar at par. As such, the Brunei dollar is accepted in Singapore as "customary tender"; likewise, the Singapore dollar is accepted in Brunei.Wikipedia