What ℿ means
Blackboard-bold pi marks a mathematical alphabet, not one fixed object; notation defines ℿ.
Blackboard bold grew from doubled typewriter letters and chalkboard strokes in the late 1950s and 1960s. Its peers ℂ, ℕ, ℚ, ℝ, and ℤ commonly name number sets; ℿ has no equally widespread assignment.
It suits equations and technical notes; in ordinary prose it reads as specialist notation.
Part of the collection
Don't confuse it with
3
Related characters
1
Questions people ask
1Does ℿ look different in different fonts?
Yes. Fonts vary in serif details, while the encoded character remains ℿ.
More like this
11
How to type or find ℿ
- Also called
- blackboard-bold pi · double-struck pi
- Search it as
- mathbb pi · blackboard bold pi
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
HTML
ℿCSS
\213FHow to type ℿ
Use a Unicode picker or enter 213F through your editor's Unicode hex-input mode; shortcuts vary by app.
Codes and encoding1 code points
HTML decimal
ℿ
HTML hex
ℿ
CSS content
content: "\213F";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%84%BF
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.