Mathematical Bold Capital A 𝐀
Visual Description: A bold uppercase A with thick, even strokes. The glyph looks compact and geometric, with clean angles. In math text it signals emphasis and distinction from lighter letters. In user interfaces it often appears as a labeled marker for a variable, a vector, or a matrix.
Meaning & Usage: In mathematics and typography, bold letters mark special roles. They often denote vectors, matrices, or quantities that need emphasis. Software and calculators use bold forms to distinguish inputs from results, or to highlight items in lists. People read bold symbols as focal points in formulas and comparisons.
Historical Background: The family of math alphanumeric symbols expanded to include bold forms to aid readability in dense equations. Printers and early typesetters used heavier letters to mark important terms. Digital fonts added broader support for Unicode bold variants, making these glyphs available in editors, calculators, and graphing tools.
Practical Use: In calculators and quick UI controls you can apply bold formatting to highlight a variable or to flag a value for comparison. Use bold letters when drawing graphs to show vectors or directions. In templates, toggle bold on a symbol to switch contexts from input to result without rewriting formulas.
See our category page for related symbols.
Look‑alikes: A (U+41).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D400 - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 0041 - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 90 80 - UTF-16:
D835 DC00 - UTF-32:
0001D400 - HTML dec:
𝐀 - HTML hex:
𝐀 - JS escape:
\u{1D400} - Python \N{}:
\N{MATHEMATICAL BOLD CAPITAL A} - Python \U:
\U0001D400 - URL-encoded:
%F0%9D%90%80 - CSS escape:
\1D400
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+1D400 or a built‑in character picker.
HTML: use the numeric entity 퐀 (hex) or 퐀 (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.