A subgroup of ISO/IEC JTC1/SC2/WG2, the Ideographic Rapporteur Group (IRG) advises the Unicode Consortium on Han character additions to the repertoire of the Unicode and ISO/IEC 10646-1 (Universal Multiple-Octet Coded Character Set) character set standards, and on Han unification. The working members of the IRG are either appointed by member governments, or are invited experts from other countries. IRG members include Mainland China, Hong Kong, Macao, Taipei Computer Association, Singapore, Japan, South Korea, North Korea, Vietnam and USA.