Home›Mathematical notation›blackboard bold🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsРусскийไทย한국어中文日本語EntityQ1142171· pop 14· linked from 233 articlesblackboard boldAlso known as double-struck, double strucktypeface, used in mathematics, that doubles certain lines of the symbolWikidata factsImageBlackboard gras.svgSources (2)wikidata.orgarchive.orgvia Wikidata · CC0Available in 13 languagesEspañolFrançaisDeutsch日本語РусскийPortuguêsItalianoAfrikaansBasqueCatalanไทยConnectionsprime numberEntitytypographyEntityCategoriesMathematical notationMathematical typefaces