🌐EnglishEnglishDeutschEspañolFrançaisItalianoРусский中文日本語EntityQ838442· pop 12· linked from 16 articlesSzilassi polyhedronnonconvex polyhedron with seven faces all of which abut each otherConnectionspolyhedronEntitygeometryEntityCategoriesNonconvex polyhedraToroidal polyhedraUnsolved problems in mathematics