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𝐟

mathematical bold small f

Mathematical Bold Small F

𝐟 is a mathematical variable in bold; the formula defines its role. Physics and engineering often use bold letters for vectors, but bold f has no universal definition.

Text symbol
Search it as
bold f · vector f
Shows up in
Anything that takes text · its shape is whatever your font draws

What 𝐟 means

The formula’s notation decides.

If you’re reading vector f, check the notation key; other fields assign bold letters different roles.

Why was bold f encoded separately?

Math notation uses weight to distinguish symbols. Mathematician E. B. Wilson’s 1901 textbook used bold for vectors and ordinary type for scalars. In 1999, Unicode proposed expanding earlier math-like letters into full alphabets so those meanings could survive in plain text.

Made for mathematical notation, where bold weight can carry meaning.

Don’t assume bold f means a vector.

Don't confuse it with

1
f
Latin Small Letter F
Rich-text bold can make ordinary f look similar, but it remains a different character; 𝐟 encodes the math style.

Questions people ask

1

Why does 𝐟 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 𝐟

Windows (Word)
Alt+XType 1D41F, then Alt+X to get 𝐟.
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 small f”.
Linux
Ctrl+Shift+UType 1d41f, then Enter or Space.
HTML
𝐟
CSS
\1D41F
HTML
Write `𝐟` in HTML source. If software applies NFKC/NFKD text normalization, it becomes plain f and loses the math distinction.
Codes and encoding1 code points
HTML decimal
𝐟
HTML hex
𝐟
CSS content
content: "\1D41F";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%F0%9D%90%9F
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.

Families this belongs to

2

Letters1,265 symbols

µʹـ℀℁ℂ℃℄℅℆ℇ℈

Fancy letters996 symbols

𝐀𝐁𝐂𝐃𝐄𝐅𝐆𝐇𝐈𝐉𝐊𝐋