Mathematical Bold Script Capital B 𝓑

Visual Description: The character appears as a bold, flowing B with extended swashes that hint at script handwriting. It sits heavier than a plain letter and carries a formal, elegant rhythm. In formulas and diagrams, it stands out without breaking line flow, especially in digital interfaces and calculators.

Meaning & Usage: In math, this bold script B is used to mark a special object, such as a variable, a space, or a named entity in a set of equations. It signals distinction from ordinary letters and helps group related terms in a compact, readable way. Software may render it automatically in bold.

Historical Background: Plain typefaces evolved to support clearer math notation. Editors and designers created script and bold variants to convey emphasis, elegance, or a special role for objects in equations. Early digital systems later carried these styles into keyboards, fonts, and rendering rules, enabling consistent visual cues across tools.

Practical Use: In teaching and tools, the bold script B helps separate a standout object from other symbols. Writers apply it to denote a key variable or a distinguished space. Calculators and UI controls offer quick options to switch styles or compare values, preserving clarity during long formulas.

See our category page for related symbols.

Look‑alikes: B (U+42).

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