What 𝕓 means
It marks a b in a distinct math alphabet. Chalkboard writers doubled strokes to make symbols stand out without filling them in. Robert Gunning and Hugo Rossi's 1965 textbook is an early printed example. Unicode later extended the style to lowercase letters, including 𝕓.
Part of the collection
Don't confuse it with
1
Questions people ask
2Can text processing change 𝕓 to b?
Yes. NFKC or NFKD can strip its mathematical style, leaving plain b; this helps loose matching but loses the distinction.
Why is 𝕓 missing on my screen?
Likely a font gap. The available font may lack this glyph or draw the double-struck style differently.
More like this
11
How to type or find 𝕓
- Search it as
- mathbb · blackboard · openface
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
macOS
HTML
𝕓CSS
\1D553Codes and encoding1 code points
HTML decimal
𝕓
HTML hex
𝕓
CSS content
content: "\1D553";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%F0%9D%95%93
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.