Mathematical Bold Fraktur Capital X 𝖃

Visual Description: The symbol is X written as Mathematical Bold Fraktur. It has sharp angles and a bold, geometric look. The strokes are thick and uniform. It feels formal and distinctive. In formulas it stands for a variable or parameter. On screens it appears as a stylized token in math notation.

Meaning & Usage: It marks a variable or reference in math. The Fraktur style signals emphasis or a special role. It helps separate this X from other letters in dense equations. Teachers and software use the style to group objects by form. In documents, it can indicate a matrix label or function argument.

Historical Background: In a broad typography tradition, decorative scripts were used to embellish manuscripts and highlight important terms. Bold Fraktur shapes appeared in print to set apart special ideas. Over time, mathematicians adopted these shapes in digital fonts to distinguish variables and objects. The history stretches across many regions without pinning to a single moment.

Practical Use: In teaching and exams, bold Fraktur X marks a variable in formulas shown on screens and paper. In calculators and apps, you may see it as a graphic for a variable slot. Quick UI controls help with operations or comparisons, such as toggles, sliders, and presets to set X or compare X to Y. It is also used to label functions or templates in math work.

See our category page for related symbols.

Look‑alikes: X (U+58).

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