Mathematical Bold Italic Small D 𝒅
Visual Description: It looks like a small Latin d set in bold and slanted italics. The strokes are thick and smooth, with a narrow bowl and a subtle tail. In many math fonts it stands out at small sizes on screens & in print. It is used as a variable marker in formulas.
Meaning & Usage: This glyph signals emphasis on a d used as a variable or parameter. It helps distinguish a specific quantity from regular letters in a line of math text. It is common in settings where bold faces denote vectors, independent parameters, or differential style. It pairs with other symbols.
Historical Background: The bold italic d belongs to a family of styled letters created for clear math notation. Designers and typesetters later adopted digital fonts that keep the same emphasis in visible screens. The idea is to keep important letters legible when many symbols crowd a page, without naming a person or place.
Practical Use: In formulas and calculators it can mark a focused variable or a parameter in models. Quick UI controls let you switch to bold italic style or insert a symbol with a single tap. You can compare quantities, run quick checks, or apply the glyph in math editors.
See our category page for related symbols.
Look‑alikes: d (U+64).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D485 - General Category:
Ll - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 0064 - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 92 85 - UTF-16:
D835 DC85 - UTF-32:
0001D485 - HTML dec:
𝒅 - HTML hex:
𝒅 - JS escape:
\u{1D485} - Python \N{}:
\N{MATHEMATICAL BOLD ITALIC SMALL D} - Python \U:
\U0001D485 - URL-encoded:
%F0%9D%92%85 - CSS escape:
\1D485
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+1D485 or a built‑in character picker.
HTML: use the numeric entity 풅 (hex) or 풅 (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.