Mathematical Double-Struck Small Y 𝕪

Visual Description: The symbol appears as a small y with a double-stroke design, built from two parallel vertical lines connected by a curved tail. It carries a scholarly look, often rendered in bold or blackboard fonts. In math texts and on screens, it stands apart from ordinary letters to signal a special status.

Meaning & Usage: This double-struck small y is a typographic variant used to mark a particular object in a formula. It is not a universal constant or operator. In software and textbooks, it may denote a distinguished variable or a set membership indicator with a distinct visual cue.

Historical Background: The double-struck style grew from a need to emphasize certain letters in early mathematical writing. It became common in print and later in digital fonts, where designers created dedicated styles for sets and special variables. The trend spread through textbooks, software, and typesetting tools as a recognizable convention.

Practical Use: In calculations and formulas, use the symbol to distinguish a special variable or object. Calculator and math apps may offer a quick UI control to insert such double-struck glyphs or to toggle between standard and highlighted notation. Clear usage helps readers compare values and track meaning.

See our category page for related symbols.

Look‑alikes: y (U+79).

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