Bureau International de l¡¯Heurel £¬BIH

International Mathematical Union, IMU

international crystal symbol

international quarantine

International Union of Pure and Applied Chemistry, IUPAC

International Union of Pure and Applied Physics, IUPAP

international temperature scale 1990, ITS 90

International Society of Soil Science, ISSS

international practical temperature scale 1968, IPTS 68

international gravity formula

International Astronomical Union,IAU

International Atomic Time,TAI