Mathematical Bold Capital F 𝐅

Visual Description: The symbol is a bold, geometric F shaped glyph. It has thick strokes and clean edges, giving it weight on the page. In math texts it often marks a function or a mapping at the start of an equation. It pairs with parentheses and variables without crowding the line. It feels formal and clear.

Meaning & Usage: Bold uppercase letters are used to distinguish objects in formulas. This F often denotes a function, a map, or a designated object in an equation. The bold face helps separate it from ordinary letters such as f or x. In text and slides, F signals a defined rule that you apply to inputs.

Historical Background: The use of bold alphanumeric symbols emerged in teaching and publishing to reduce confusion in dense formulas. Bold forms were adopted to mark vectors, matrices, or special operators, and later extended to function labels. Designers and typographers created consistent bold variants so readers can scan formulas and identify structure quickly.

Practical Use: In classroom notes and papers, bold F helps show a function name or a rule. On calculators and math apps, quick UI controls may use bold labels like F to access the function menu or to compare results quickly. When you type, keep spacing clear and use F with parentheses: F(x).

See our category page for related symbols.

Look‑alikes: F (U+46).

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