What 𝓩 means
The formula gives this script Z its role.
Script capitals can name operators, functions, or transforms; bold weight may distinguish a further mathematical object. This Z has no standard assignment.
By 1999, math writing already used these styles. That year, the STIX project, a scientific-publishing collaboration, asked Unicode to encode mathematical alphabets separately so plain-text formulas could preserve their distinctions.
Don't confuse it with
1Questions people ask
1Why does 𝓩 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 𝓩
Windows (Word)
Alt+XType 1D4E9, then Alt+X to get 𝓩.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “mathematical bold script capital z”.
Linux
Ctrl+Shift+UType 1d4e9, then Enter or Space.
HTML
𝓩CSS
\1D4E9Codes and encoding1 code points
HTML decimal
𝓩
HTML hex
𝓩
CSS content
content: "\1D4E9";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%F0%9D%93%A9
1
On screen
1
Code points
2
JS .length
4
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.