🌐EnglishEnglishDeutschEspañolFrançaisItalianoРусский中文日本語EntityQ896057· pop 10· linked from 30 articlesBoy's surfacethree-dimensional self-intersecting surface, an immersion of the real projective planeAvailable in 9 languagesEspañolFrançaisDeutsch日本語РусскийItalianoSlovenianUkrainianvia Wikidata sitelinks · CC0Connectionsthree-dimensional spaceEntityMöbius stripEntityCategoriesCommons link from WikidataGeometric topologySurfaces