IIB or IIb may refer to: IIb, a diamond type IIb, a type of type II supernova Intergranular and Interphase Boundaries (IIB) in Materials, a series of triennial international conferences which started in Paris (France) in 1989 International Investment Bank, a multilateral development bank "Ice Ice Baby", a hip hop song written by American rapper Vanilla Ice International Patent Institute (Institut International des Brevets), an intellectual property organisation established on June 6, 1947, now defunct Islamic International Brigade, an international unit of Islamist mujahideen founded in 1998 KBC Bank Ireland, (established in 1973 as Irish Intercontinental Bank), one of the leading non-retail banks in Ireland Type II string theory (type IIB), described by type IIB supergravity in ten dimensions IBM Integration Bus, an enterprise service bus software product by IBM A rating in the Hong Kong motion picture rating system