The British Standards Institution (BSI) develops and publishes standards that are used extensively by exporters and importers. They are used both in government and industry by those who are involved in engineering, designing, production, testing and construction. BSI represents the British industry to the ISO, IEC, CEN and CENELEC. These bodies develop the international and European standards. The letters BS precede the standard's numerical code and may also include the alloy's designation. If CEN standard has been adopted the prefix is BSEN Example: BS 1429(80); BS 1449/1; BS 970/1; BS S.155; BS DTD; BS 3468