The Solomon Islands dollar (ISO 4217 code: ''SBD'') was introduced in 1977, replacing the Australian dollar at par. Its symbol is "SI$", but the "SI" prefix may be omitted if there is no confusion with other currencies also using the dollar sign "$". It is subdivided into 100 cents. Local shell money is still important for traditional and ceremonial purposes in certain provinces and, in some remote parts of the country, for trade. Shell money was a widely used traditional currency in the Pacific Islands, in Solomon Islands, it is mostly manufactured in Malaita and Guadalcanal but can be bought elsewhere, such as the Honiara Central Market. The barter system often replaces money of any kind in remote areas.