Standards and Organisations BIS means Bureau of Indian Standards BS means British Standards ASTM means American Standard for Testing Materials AASHTO means American Association of State Highway and Transportation Officials ACI means American Concrete Institute ANSI means American NationalStandard Institute ISO means International Standard Organisation IEC means International Electro-technical Commission NEN means Dutch National Standards DIN means Deutsches Insitut für Normung (German Institute for Norms) USBR means United States Bureau of Reclamation