Mathematical Bold Small X 𝐱

Visual Description: This character is a bold, compact lowercase x. It has clean lines and consistent stroke width. It looks compact on both screen and print. It stands out in formulas and interfaces. It is designed to be readable in small sizes on calculators and charts. The shape communicates a variable, a placeholder, or a general value in math.

Meaning & Usage: This symbol signals a variable in equations and graphs. In data displays it marks an unknown value. In user interfaces, it can toggle options, drive comparisons, or act as a placeholder for input. It pairs with operators like +, -, ×, ÷, making expressions clear and concise.

Historical Background: Across many styles, bold forms have been used to emphasize symbols in print and digital displays. The move to bold mathematical alphanumeric symbols came with modern typography, where legibility in small pixels mattered. This x variant follows that goal, providing emphasis without losing readability in formulas.

Practical Use: On calculators and software, the symbol is used in command keys or as a variable in equations. It appears in legends, tooltips, and quick UI controls for operations or comparisons. Writers and developers choose a bold x for emphasis and fast recognition in dense screens and reports.

See our category page for related symbols.

Look‑alikes: x (U+78).

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