Mathematical Bold Capital H 𝐇

Visual Description: This symbol appears as a bold, solid capital H with heavy strokes. It is designed to stand out in mathematical and technical text. The glyph mirrors a standard uppercase H, but its lines are thicker and more uniform. It blends with other bold letters in formulas.

Meaning & Usage: It marks a math object as distinct from ordinary text. In many formulas, a bold H signals a variable, a matrix row, or a special set member. It helps readers distinguish focus items. In software, bold symbols appear in quick UIs for operations or comparisons.

Historical Background: The bold style grew from traditional typesetting, where thicker strokes marked emphasis in math notes. As digital text evolved, fonts added bold variants for letters. Over time, bold letters became a standard tool to distinguish variables, operators, and special objects in notation, across many disciplines.

Practical Use: In teaching and software, bold symbols help readers spot important quantities. A bold H can denote a key variable or a matrix element in equations. Calculators and math editors often offer quick UI controls to toggle bold or compare terms, improving clarity and readability.

See our category page for related symbols.

Look‑alikes: H (U+48).

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