What ℱ means
The surrounding formula decides.
In Fourier analysis, ℱ names the Fourier transform, a way to describe a function by its frequencies. Elsewhere, the writer defines it.
Use plain F for prose styling; special math letters can disrupt search and text restyling.
Formal mathematical notation; read the surrounding formula.
Don't read ℱ as “for all”; is the logic symbol.
Part of the collection
Don't confuse it with
1
Related characters
2
Questions people ask
1Why does ℱ look different in different fonts?
Fonts draw its strokes and loops differently; it remains the same character.
More like this
10
How to type or find ℱ
- Search it as
- script F · Fourier transform · mathscr F
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
HTML
ℱCSS
\2131Microsoft Word
To type ℱ in a Word equation, enter
\mathscr{F}; Microsoft's guide lists this as of 2026.Codes and encoding1 code points
HTML decimal
ℱ
HTML hex
ℱ
CSS content
content: "\2131";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%84%B1
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.