Mathematical Script Capital X 𝒳

Visual Description: This character is a stylized, calligraphic uppercase X. It has flowing strokes that resemble handwriting. The lines curve softly and the arms tilt. In fonts it reads as a decorative variant of X, not a plain Roman letter. It appears in math editors and display fonts with elegance.

Meaning & Usage: In math, this script X denotes a special variable, a named object, or a distinct symbol in formulas. It signals a concept that differs from ordinary X. It can mark a space, a function input, or a set element, improving readability and distinction.

Historical Background: In this part of the symbol family, script forms were developed to support expressive math notation. The idea is to separate ideas without clutter. The broader effort involves fonts, encoding schemes, and typography practice. The trend is general, aiming for clear distinction across many fields of math.

Practical Use: In formulas and on calculators, script X helps mark a distinguished variable or a labeled input. It supports quick UI controls for switching styles or selecting symbols during entry. For comparisons, it can denote a reference value, a target, or a tested example, guiding steps in computations and proofs.

See our category page for related symbols.

Look‑alikes: X (U+58).

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