Mathematical Bold Small E 𝐞

Visual Description: The glyph is a bold, compact lowercase e used in mathematical fonts. It has thicker strokes than ordinary text letters and a uniform, rounded shape. In print and on screens it reads clearly as a variable symbol. It is chosen for emphasis without changing the letter's basic meaning.

Meaning & Usage: It signals a bold variable rather than plain text. In formulas it can denote a vector, a parameter, or a distinguished quantity. In education and software, bold letters help readers track components and avoid confusing a scalar e with other symbols. Calculators may switch fonts to show emphasis.

Historical Background: The practice grew from a need to separate multiple styles of the alphabet in math notation. Digital typography added bold variants to cover all letters, making it easier to express vectors, matrices, and sets. Throughout this evolution, designers kept the characters visually close to the ordinary e while adding weight.

Practical Use: In math software and calculators, bold symbols help organize equations and guides quick comparisons. You might see a bold e in a basis vector label or in a legend for a graph. UI controls can toggle bold styling, adjust emphasis, or switch between scalar and vector views for operations.

See our category page for related symbols.

Look‑alikes: e (U+65).

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