🌐EnglishEnglishDeutschEspañolFrançaisNederlandsPolskiPortuguêsРусскийفارسی中文EntityQ2396808· pop 16· linked from 10 articlesViviani's curvefigure-eight shaped three-dimensional curve, the intersection of a sphere with a cylinderAvailable in 15 languagesEspañolFrançaisDeutschРусскийPortuguêsArmenianBasqueBulgarianCatalanNederlandsPolskiConnectionsmathematicsEntityInternational Standard Book NumberEntityCategoriesGeometric intersectionSpherical curves