Mathematical Bold Italic Capital B 𝑩

Visual Description: The bold italic B is a single Latin letter rendered with thick strokes and a forward slant. In math fonts it appears darker than ordinary text and stands out when used in formulas. The shape is clean and geometric, matching other bold italic letters that mark emphasis in equations.

Meaning & Usage: This letter marks a variable or a special symbol in math writing. In many textbooks and tools it signals emphasis or a distinct class, such as a vector or a parameter. It helps separate variables from regular text and aligns with other bold italic symbols in a formula.

Historical Background: In the suite of mathematical alphanumeric symbols, bold italic forms were added to provide a distinct look for variables and objects in equations. The idea is to offer a readable, consistent way to signal importance or different roles for letters while keeping compatibility with plain text. It is part of a broader effort to support math typography.

Practical Use: In calculators, editors, and UI you can apply bold italic styling to a variable like B to stress its role. Provide quick UI controls to toggle font style or to switch between emphasis and standard text for comparisons. Use such styling to clarify formulas, results, and steps in calculations.

See our category page for related symbols.

Look‑alikes: B (U+42).

Need styled alternatives? Try the Fancy Text tool.