Mathematical Bold Capital B 𝐁

Visual Description: The glyph looks like a bold, rounded B with thick strokes. It belongs to a family that uses heavy weight for emphasis in math. On screens or paper, it appears taller and darker than regular letters. It contrasts with lighter text in formulas, labels, and headers.

Meaning & Usage: This symbol signals bold emphasis in mathematical notation. It can denote variables, vectors, or constants in a way that stands out from italicized or plain letters. In calculators and software, it helps separate labels from values and guides quick comparisons in a single glance.

Historical Background: The bold mathematical letter emerged with the rise of typesetting that needed clear distinction in dense equations. It evolved with digital fonts and standardized encoding so programs could render it consistently. Designers extended the bold style to mathematical sets, improving readability in dense formulas and tables.

Practical Use: In practice, bold math letters help organize content in keyboards, editors, and calculators. Users mark important quantities, compare values, or label vector components. Quick UI controls let you switch styles, apply bold to selected math, or highlight terms in an equation for faster reasoning.

See our category page for related symbols.

Look‑alikes: B (U+42).

Need styled alternatives? Try the Fancy Text tool.