Mathematical Bold Capital D 𝐃
Visual Description: The mathematical bold capital D is a thick, solid letter. It keeps the familiar rounded edge but uses a heavy stroke with uniform width. The symbol sits on neutral space and contrasts with regular text. In certain fonts it resembles other bold math letters, signaling emphasis or special meaning.
Meaning & Usage: In math notation, bold capitals mark quantities that deserve emphasis or denote special kinds. A bold D may represent a vector, a dimension, or a distinguished constant in equations. In diagrams and proofs, it helps readers follow a specific quantity without confusing it with nearby symbols.
Historical Background: The use of bold letters grew as printing and typography evolved. Early mathematics relied on italic or upright styles to separate roles, while bold faces introduced a way to emphasize notable quantities. In digital writing, mathematical fonts adopted bold variants to distinguish vectors, matrices, and named quantities.
Practical Use: In formulas and calculations, bold symbols stand out in equations and UI displays. A bold D helps track a dimension or a primary quantity during quick checks. On calculators and software, you may see bold variants in mode selectors, plots, or comparison tools to highlight key values.
See our category page for related symbols.
Look‑alikes: D (U+44).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D403 - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 0044 - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 90 83 - UTF-16:
D835 DC03 - UTF-32:
0001D403 - HTML dec:
𝐃 - HTML hex:
𝐃 - JS escape:
\u{1D403} - Python \N{}:
\N{MATHEMATICAL BOLD CAPITAL D} - Python \U:
\U0001D403 - URL-encoded:
%F0%9D%90%83 - CSS escape:
\1D403
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+1D403 or a built‑in character picker.
HTML: use the numeric entity 퐃 (hex) or 퐃 (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.