Mathematical Italic Small K 𝑘

Visual Description: A mathematical italic small k is a slender, slanted letter used for variables in formulas. It looks like a k but tilted and light. The shape helps it stand out as a symbol rather than plain text. It is usually drawn in a consistent italics style in math books and software.

Meaning & Usage: A small italic k marks a variable, parameter, or index in equations. It is not a fixed number or operator. The italic form helps distinguish variables from constants and functions. In algebra, calculus, and coding, k appears wherever a changing quantity is needed.

Historical Background: In the history of mathematical typography, letters were set in upright type for prose and in an italic style for variables. This distinction helped readers tell apart constants from variables at a glance. As tools and fonts evolved, mathematical italics became standardized across many regions and programs.

Practical Use: In formulas and on calculators, the italic small k is used as a variable symbol in inputs and results. Quick UI controls like sliders and small buttons can adjust k to show how a formula responds. This helps with comparisons, simulations, and real time feedback as values change.

See our category page for related symbols.

Look‑alikes: k (U+6B).

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