What 𝑘 means
It marks a variable; the formula tells you what k stands for.
This Unicode math-font k has a separate encoded style; in 𝑘 3, for example, the equation assigns it the value 3. Mathematicians use italic type for variables and quantity symbols, while this letter's specific job still depends on the formula.
Math letters predate this glyph: Greek mathematicians used letters for quantities, and Diophantus used one for an unknown around 250 CE. In 1202, Fibonacci's Liber abbaci, a Latin arithmetic book, used small Latin letters for given numbers. In 1591, François Viète separated unknowns from known quantities with capital vowels for the unknowns and consonants for known values. René Descartes's 1637 book La Géométrie established lowercase italic letters for unknowns, using early-alphabet letters for known values and late letters for unknowns. This compact notation put operations in view instead of spelling them out.
This encoded math style belongs in mathematical or technical notation; ordinary italic prose should use text formatting.
The glyph does not name one fixed constant; each formula defines what k represents.
Part of the collection
Don't confuse it with
2
Related characters
1
Combination ideas
1Questions people ask
2Why does 𝑘 turn into plain k?
Compatibility normalization can do that: NFKC maps this mathematical alphabet character to the base Latin letter, removing the encoded style distinction.
Why does 𝑘 look different or disappear on my device?
It can. A font or renderer may lack this mathematical glyph or use a different shape; the character itself has not changed.
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11
How to type or find 𝑘
- Search it as
- fancy k · math font k · unicode k · special k symbol · k math symbol
- Shows up in
- Anything that takes text · its shape is whatever your font draws
𝑘\1D458𝑘.$...$, type k; LaTeX renders Latin letters in math mode as italic. That produces the math-italic appearance, not this exact Unicode character in the source.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.