Mathematical Script Capital K 𝒦

Visual Description: The character appears as a flowing, calligraphic uppercase K with rounded loops and swashes. The strokes are smooth, with a tall ascender and a slight tilt that gives it elegance. In digital typography, it sits in a formal script style beside other script letters. Its edges catch light in print.

Meaning & Usage: This letter marks a special variable or function name in formulas. It signals a chosen object in equations, not a generic placeholder. In citations or proofs, it stands out as a distinguished symbol. Software often treats it as a typographic variable for clarity. It often signals a special role in equations.

Historical Background: Script letters have long roots in mathematical writing. They appeared as stylistic marks in early notation, then became common in algebra and geometry as a way to separate topics. The style spread with printers and type designers who valued readable distinctions among symbols. This allowed clearer studies and taught use of script capitals.

Practical Use: In formulas, you may see this K used as a variable, a name, or a constant fine-tuned by context. In calculators and math editors, switch to a script font for distinction. Quick UI controls let you insert the symbol, compare it with others, or apply it in blocks of operations.

See our category page for related symbols.

Look‑alikes: K (U+4B).

Need styled alternatives? Try the Fancy Text tool.