What 𝘂 means
It is a bold, sans-serif form of lowercase Latin u. Sans-serif means its strokes end without small finishing lines. In a formula, this style distinguishes the symbol from plain u or other letter forms; the equation tells you what the variable denotes.
Mathematicians used letter styles to distinguish symbols before Unicode encoded this set in 2001. The encoding drew on work including the STIX fonts project and was intended for mathematical and technical notation. MathML, a markup language for equations, can express the same style on ordinary u or with the dedicated character 𝘂.
Is 𝘂 just bold u?
No; it is a separate Unicode character, not a font setting. A bold toggle changes the appearance of ordinary u; this character stores its bold sans-serif form in the text itself. In formulas, that distinction can carry mathematical meaning. For ordinary prose, use text formatting instead: separate styled letters can make searching, editing, or restyling less reliable.
Part of the collection
Don't confuse it with
2Questions people ask
2Why did 𝘂 turn into plain u?
NFKC, Unicode’s compatibility-normalization form, maps 𝘂 to ordinary Latin u. This folds the styled form to its base letter and removes the bold sans-serif distinction.
Why does 𝘂 look different across devices?
The available font draws the glyph, so its curves and stroke weight can vary. If the fonts available to an app do not include this character, it may appear as a missing-character box.
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uLatin Small Letter U𝗨Mathematical Sans-Serif Bold Capital U𝘶Mathematical Sans-Serif Italic Small U𝚞Mathematical Monospace Small U𝗎Mathematical Sans-Serif Small U𝘀Mathematical Sans-Serif Bold Small S𝘁Mathematical Sans-Serif Bold Small T𝘃Mathematical Sans-Serif Bold Small V
µMicro SignʹGreek Numeral Sign
ـArabic Tatweel℀Account Of℁Addressed To The SubjectHow to type or find 𝘂
- Search it as
- bold u · math bold u · sans-serif u · fancy u · unicode u · bold letter u
- Shows up in
- Anything that takes text · its shape is whatever your font draws
𝘂\1D602𝘂 in markup; the parser yields 𝘂 as text.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.