Mathematical Bold Fraktur Capital Y 𝖄

Visual Description: Rendered as an uppercase Y, this glyph uses a bold Fraktur style. It shows angular strokes and a slightly ornate silhouette, echoing traditional blackletter shapes. It is heavier than a regular Latin Y and stands out in equations and labels.

Meaning & Usage: The symbol signals a distinct object or variable in formulas. In texts and software, it may be used to distinguish a particular space, set, or operator from ordinary letters. It helps readers recognize a special category while keeping the rest of the notation familiar.

Historical Background: Fraktur originates from older typography and has been adapted for mathematical notation. Bold Fraktur variants are not common in everyday writing, but they appear in specialized fonts to provide visual distinction. The idea is to separate types of mathematical objects by look, not just by letter.

Practical Use: In formulas and calculators, this letter can denote a special object or a selected variable. In user interfaces, quick controls or toggles may switch between standard Y and its Fraktur form to compare values, group related quantities, or designate a special dataset. It helps keep calculations readable at a glance.

See our category page for related symbols.

Look‑alikes: Y (U+59).

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