What is Chữ Hán?
{{Infobox writing system | name = Chữ Hán | altname = Chữ Nho | sample = Chữ Hán chữ Nho.svg | type = [[Logographic]] | caption = ''Chữ Hán'' and ''chữ Nho'' written in [[chữ Nôm]], with [[chữ Quốc ngữ]] on the right. | languages = [[Chinese language|Literary Chinese]], [[Vietnamese language|Vietnamese]] (written in chữ Nôm) | time = 3rd century BC – 20th century AD, present (limited usage) | fam1 = [[Oracle bone script]] | fam2 = [[Seal script]] | fam3 = [[Clerical script]] | fam4 = [[Regular script]] | fam5 = | sisters = [[Kanji]], [[Hanja]], [[Zhuyin]], [[traditional Chinese characters|traditional Chinese]], [[simplified Chinese characters|simplified Chinese]], [[Khitan small script|Khitan script]], [[Jurchen script]], [[Tangut script]], [[Yi script]] | children = [[Chữ Nôm]] | unicode = | direction = Top-to-bottom, columns from right to left ([[Horizontal and vertical writing in East Asian scripts|traditional]]) | iso15924 = }} '''Chữ Hán''', meaning 'Han characters' in [[Vietnamese language|Vietnamese]], refers to [[Chinese characters]] used in [[Vietnam]]. They were employed for writing [[Literary]] [[Chinese language|Chinese]] (Hán văn) and Sino-Vietnamese words in the [[Vietnamese language]]. [[Vietnam]] started using Chữ Hán during the [[Han dynasty|Han dynasty's]] rule over the Red River Delta region, persisting until the early [[20th century]] (111 BC – 1919 AD). However, as Literary Chinese lost its prominence with the end of [[Confucianism|Confucian]] court examinations, Chữ Hán gradually faded from use.<ref>{{Cite book|title=Sinography: the borrowing and adaptation of the Chinese script|last=Handel|first=Zev|date=2019|publisher=Brill|isbn=978-90-04-38632-7|series=Language, writing and literary culture in the Sinographic Cosmopolis|location=Leiden Boston}}</ref><ref>{{Cite journal|last=Cu̓ò̓ng|first=Nguyễ˜n Tuấn|date=September 2019|title=Research of square scripts in Vietnam: An overview and prospects|url=http: