Mathematical Fraktur Capital O 𝔒

Visual Description: The symbol is a large uppercase O crafted in a Fraktur style, with bold, angular strokes and delicate curves. It forms a closed loop with strong contrast between thick and thin lines. Decorative serifs give it an old print feel, yet it reads clearly when used in formulas or UI labels.

Meaning & Usage: In mathematics and typography, a stylized Fraktur O signals a labeled object, constant, or operator without changing its numeric value. It is chosen for emphasis, branding, or to match a design system. In quick tools, it can mark a placeholder, identifier, or entry in a formula.

Historical Background: Fraktur and related blackletter styles appeared in early print and manuscripts, shaping how letters carried character and authority. In modern typography, designers revive and adapt these shapes for emphasis, branding, or cultural reference. In mathematics, stylized glyphs are adopted by fonts to offer variety without altering meaning.

Practical Use: In calculators and user interfaces, a bold Fraktur O can serve as a decorative header or a quick control for operations or comparisons. It may label a special mode, denote a set, or stand in for a customary symbol in formulas. Keep legibility in smaller sizes and contexts.

See our category page for related symbols.

Look‑alikes: O (U+4F).

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