Mathematical Fraktur Capital X 𝔛

Visual Description: The symbol appears as a tall X drawn in a Gothic, Fraktur style. It has sharp triangles at the tips and thick and thin strokes that cross dramatically. In many fonts, the lines are angular with decorative serifs. In digital math, it stands out as a stylized variable.

Meaning & Usage: This X typically marks a variable, an unknown, or a placeholder in algebra and logic. In Fraktur typography it signals a formal, nonstandard variant of the Latin X. It can differentiate a symbol in sets, equations, or parameter lists from regular text. It is not a number.

Historical Background: Fraktur and Blackletter styles influenced many math fonts in old publications. The X in this family was adopted to keep symbols visually cohesive with surrounding letters. Over time, designers used it in textbooks and notes to emphasize variables, constants, or special cases, while keeping general math rules intact.

Practical Use: In formulas and calculators, the Fraktur X acts as a variable or label for a value to solve or compare. Quick UI controls, such as icons for switching symbols or toggling styles, can use this glyph to highlight unknowns or to compare options in a chart. It helps readability when styling equations.

See our category page for related symbols.

Look‑alikes: X (U+58).

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