What 튜 means
It normally works as a syllable within a longer Korean word. ㅌ is a t with a puff of air; ㅠ adds a y glide toward “oo.” Together they sound roughly like “tyu.” Korean input may show ㅌㅠ briefly before joining the parts.
Hangul, the Korean alphabet, was created in 1443 and explained in the 1446 Hunminjeongeum guide. Earlier systems—idu, gugyeol and hyangchal—used Chinese characters for Korean. Hangul became the public script in 1894; a Mongolian Phags-pa influence on its design is debated.
Don't confuse it with
1Questions people ask
1Why does 튜 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 튜
튜\D29CCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.