Mathematical Double-Struck Capital A 𝔸
Visual Description: The character appears as a capital A with double vertical strokes and extra horizontal bars, reminiscent of a chalkboard bold letter. In many fonts it looks like a regular A wearing a second outline. It stands out in formulas, calculators, and digital UI where emphasis or a special object is needed.
Meaning & Usage: In math, such glyphs denote special objects. The double-struck A can signify a distinguished set or a structural object within a theory, or simply serve as a visual cue in notes. In calculators or math apps, it helps users contrast this symbol from ordinary letters during quick operations or comparisons.
Historical Background: Historically, mathematical ornamentation like double-struck letters arose from typographic conventions used to mark sets, algebras, and spaces in manuscripts and early print. The practice carried into digital fonts and Unicode, preserving a familiar glyph in modern software. The idea of marking notable objects with style remained common across disciplines.
Practical Use: In practical work, keep UI simple: use formulas with the symbol to denote a special object; in calculators, a quick button or palette can insert it; in comparisons, use it to distinguish a named set from numbers. It supports clear, compact notation for quick reasoning and teaching.
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+1D538 - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 0041 - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 94 B8 - UTF-16:
D835 DD38 - UTF-32:
0001D538 - HTML dec:
𝔸 - HTML hex:
𝔸 - JS escape:
\u{1D538} - Python \N{}:
\N{MATHEMATICAL DOUBLE-STRUCK CAPITAL A} - Python \U:
\U0001D538 - URL-encoded:
%F0%9D%94%B8 - CSS escape:
\1D538
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+1D538 or a built‑in character picker.
HTML: use the numeric entity 픸 (hex) or 픸 (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.