参议会 refers to a 'council' or 'representative assembly' — a formal deliberative body that advises or legislates. It appears in historical and political contexts, such as the wartime People's Political Council (国民参议会) in Republican-era China or local councils in the PRC. The word is a compound of 参 ('to participate, to consult') and 议会 ('parliament, legislative assembly'), so it carries a sense of participatory governance. You'll most often encounter it in formal writing about pre-1949 Chinese politics or in discussions of advisory bodies.