Mathematical Double-Struck Small H 𝕙

Visual Description: The symbol appears as a small h formed with a double, blackboard style stroke. It looks like a regular h but with extra thickness and parallel lines on the vertical stem. The ends are rounded and balanced, giving a calm, readable appearance on screen. It reads as a stylized letter rather than a numeral.

Meaning & Usage: The double-struck h marks a special version of the letter. It is used in math to highlight a quantity or a named object. In many contexts, the style signals a constant, a function, or a set. In software, users can switch to this look to emphasize formality.

Historical Background: The double-struck style grew from the need to distinguish letters used as symbols in math. It arose in printed texts and on blackboards as a clear way to mark special objects. Over time, fonts and typesetting adopted this look in digital form. The result is a consistent visual language for everyday notation.

Practical Use: In writing and software, double-struck symbols help separate branded quantities from ordinary letters. They appear in formulas, stats readouts, and user interfaces. Designers add quick controls for operations or comparisons, allowing users to switch to a double-struck style with a single tap. This makes it easy to compare values or highlight a given quantity.

See our category page for related symbols.

Look‑alikes: h (U+68).

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