Mathematical Italic Capital F 𝐹
Visual Description: The symbol is a tall, slanted F in mathematical italic. The strokes are smooth with a narrow body and a curved upper segment. It reads as a variable, a function name, or a label in formulas and graphs. It looks deliberate and clean.
Meaning & Usage: In notation, uppercase italic letters often denote a function, a label, or a variable. F commonly stands for a function like F(x). It may also represent a quantity in physics or a mapping in a diagram. The italic style signals that it is not a constant.
Historical Background: The use of italic letters to mark variables grew as math and science adopted clearer notation. Stylized uppercase letters emphasized categories such as functions, forces, and mappings, while plain text constants stayed upright. This practice spread with printed books, then with calculators and software.
Practical Use: In formulas, F guides how inputs flow to outputs. In calculators and math apps, you can type F(x) and compare it to other functions with quick UI controls. Sliders and toggle buttons let you swap between F and alternative mappings, or plot F against a rival function.
See our category page for related symbols.
Look‑alikes: F (U+46).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D439 - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 0046 - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 90 B9 - UTF-16:
D835 DC39 - UTF-32:
0001D439 - HTML dec:
𝐹 - HTML hex:
𝐹 - JS escape:
\u{1D439} - Python \N{}:
\N{MATHEMATICAL ITALIC CAPITAL F} - Python \U:
\U0001D439 - URL-encoded:
%F0%9D%90%B9 - CSS escape:
\1D439
How to type / insert
Fast copy: click the Copy button near the top of this page.
By codepoint: in many editors and IDEs, you can insert via the Unicode code U+1D439 or a built‑in character picker.
HTML: use the numeric entity 퐹 (hex) or 퐹 (decimal) when an HTML entity is needed.
Compatibility & troubleshooting
Font support: if the symbol does not render, the current font likely lacks this codepoint. Choose a font with broad Unicode coverage or allow a fallback font.
Web pages: ensure your CSS font stack includes a general fallback; avoid relying on images for common symbols to preserve accessibility and copyability.