What 𝟖 means
It is eight, set in a bold mathematical style.
Unicode encoded the styled letters and digits used in formulas as separate characters because changing a symbol’s style can change its meaning there. The 1999 proposal says scientific publishers already used these distinctions and needed them preserved in digital publications.
Don't confuse it with
4Questions people ask
1Can 𝟖 become plain 8?
Yes. Compatibility normalization such as NFKC can turn the mathematical bold form into ordinary 8. That helps with matching text but erases the style distinction, so avoid it when the distinction carries meaning in a formula.
How to type 𝟖
Windows (Word)
Alt+XType 1D7D6, then Alt+X to get 𝟖.
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 digit eight”.
Linux
Ctrl+Shift+UType 1d7d6, then Enter or Space.
HTML
𝟖CSS
\1D7D6Codes and encoding1 code points
HTML decimal
𝟖
HTML hex
𝟖
CSS content
content: "\1D7D6";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%F0%9D%9F%96
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.