Mathematical Bold Capital K 𝐊
Visual Description: The bold capital K is a heavy, squarely formed letter with thick strokes and equal weight on all limbs. It stands out clearly against lighter text. In math fonts, it appears with clean edges and compact spacing, designed to fit tight formulas and compact calculator screens.
Meaning & Usage: In formulas, K often represents a constant or a coefficient. In variables, it can act as a scaling factor or a placeholder. Bold K helps distinguish it from ordinary text in dense equations. In quick UI, it may label keys or tabs for constant options and comparisons.
Historical Background: The bold style evolved from typographic emphasis rules and digital font design. It helps separate symbols from surrounding words and reduces ambiguity in dense math blocks. Across educational texts and software, bold symbols like K are used to mark invariant quantities and key parameters without dates or people mentioned.
Practical Use: In calculators and math editors, bold symbols provide a visual cue for constants and coefficients. Use K to indicate a specific multiplier in a model or a comparison threshold in a chart. Quick UI controls may offer a K button to insert a coefficient or switch modes during work.
See our category page for related symbols.
Look‑alikes: K (U+4B).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D40A - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 004B - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 90 8A - UTF-16:
D835 DC0A - UTF-32:
0001D40A - HTML dec:
𝐊 - HTML hex:
𝐊 - JS escape:
\u{1D40A} - Python \N{}:
\N{MATHEMATICAL BOLD CAPITAL K} - Python \U:
\U0001D40A - URL-encoded:
%F0%9D%90%8A - CSS escape:
\1D40A
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+1D40A or a built‑in character picker.
HTML: use the numeric entity 퐊 (hex) or 퐊 (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.