Mathematical Bold Italic Small J 𝒋

Visual Description: The symbol is a small j drawn in a bold, italic style. It keeps the basic shape of a lowercase j but with heavier strokes and a slanted posture. The stroke ends with a curved tail. It stands out when placed next to normal letters in formulas.

Meaning & Usage: In math and science, this bold italic j marks a variable or index. It can label a component of a vector or a term in a sum. The style helps distinguish it from normal letters. In teaching, it signals emphasis and clear separation of symbols.

Historical Background: The bold italic variant of mathematical letters grew with typographic tools that separate roles for symbols. It was designed to avoid confusion between similar characters and to support readable formulas. The idea spread with typesetting and later digital fonts, enabling consistent math typography.

Practical Use: In calculators and software, the bold italic j appears as a distinct variable marker in formulas and examples. It can be inserted with quick UI controls for operations or comparisons, such as swapping values, aligning terms, or spotlighting a specific index. Use it to keep notation clear.

See our category page for related symbols.

Look‑alikes: j (U+6A).

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