Mathematical Italic Capital S 𝑆

Visual Description: The character is a tall S with a distinct rightward tilt. In most math fonts it carries smooth, uniform strokes and no extra serifs. It sits cleanly among symbols in equations and text alike. The italic shape emphasizes that it represents a variable or label rather than ordinary text. It reads clearly in dense formulas.

Meaning & Usage: In mathematics, this S marks a variable, a set label, or a named function. Its italic form helps distinguish quantities from ordinary words in formulas. In education and software, you may see it used as S(x) or to name a collection S. Quick UI tools often insert it in math mode.

Historical Background: It belongs to a family of mathematical alphanumeric symbols that expanded typography for modern computation. Designers separated variables from plain text by using italic or bold styles. The range grew to support many letters in digital documents, keeping math expressions visually consistent across editors and calculators.

Practical Use: In practice, you may see this S as a standard variable in formulas or as a label in a set description. Calculators and math editors offer a math mode or symbol picker with quick buttons for operations and comparisons. You can apply italics to variables and insert S in templates easily.

See our category page for related symbols.

Look‑alikes: S (U+53).

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