Mathematical Bold Small S 𝐬

Visual Description: The MATHEMATICAL BOLD SMALL S appears as a compact, robust letter with the bold weight of a small s. It sits in a math font with clean curves and consistent stroke width. In print or on screens, it signals a distinct, emphasized variable. It pairs with other bold symbols in formulas and UI panels.

Meaning & Usage: In math notation, bold small s marks a variable or quantity that should be read with emphasis. It helps separate symbolic names from ordinary text. In teaching materials and calculators, bold symbols signal a special role, such as a parameter, a counter, or a label for a quick action. UI components may use the bold form to guide input.

Historical Background: The use of bold, specialized alphanumeric symbols grew with the rise of modern typography and digital fonts. Early print and later software adopted distinctive weights to reduce confusion when many symbols appeared together in equations. By aligning bold letters, educators and designers created clearer screens and readable handouts.

Practical Use: In practice, these symbols improve readability in dense formulas. They appear in calculators, math apps, and data dashboards to label variables or show emphasis. Quick UI controls may use bold forms to indicate actions like sum, compare, or switch modes. The bold small s helps users follow steps and results.

See our category page for related symbols.

Look‑alikes: s (U+73).

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