U+1D48B𝒋𝒋<mi>𝒋</mi>Semantic identity and intent
Characters to distinguish
- = — Equals Sign
Use 𝒋 in the right format
Meaning and usage
𝒋 is the Unicode character named mathematical bold italic small j. For Bold Italic Small J (𝒋), its mathematical meaning depends on the surrounding convention, alphabet style, or operator definition.
Use 𝒋 when the source convention requires this exact character. For Bold Italic Small J (𝒋), define styled letters and specialized glyphs explicitly, because visually similar Unicode characters may not be semantically interchangeable.
Pronunciation: bold italic small j
Formula examples
𝒋 = xf(𝒋)How to type Bold Italic Small J
- Windows
- Use Character Map or enter Unicode 1D48B in a Unicode-aware application.
- macOS
- Open Character Viewer and search for mathematical bold italic small j.
- Microsoft Word
- Type 1D48B, then press Alt+X in Microsoft Word where supported.
- iPhone and iPad
- Copy and paste 𝒋, or use a math/LaTeX app. The standard iOS keyboard may not expose every mathematical symbol.
- Android
- Copy and paste 𝒋, or use a math keyboard or LaTeX editor. Keyboard layouts vary by device and app.
- Google Docs
- For plain text, paste 𝒋 or use Insert → Special characters. For structured math, use the equation editor and verify 𝒋.
- Excel
- Paste 𝒋 into a cell or use Insert → Symbol when available. Ordinary cells preserve the character but do not interpret LaTeX commands.
Common mistakes
- Do not substitute a visually similar Latin or differently styled character for 𝒋; case and mathematical alphabet style can identify different quantities.
- For plain text, copy 𝒋 as U+1D48B; for structured equations, use 𝒋 in math mode. A look-alike glyph or image can break search, accessibility, or parsing when the intended character is Bold Italic Small J.
When to use 𝒋
- Use 𝒋 in plain text when a Unicode character is appropriate and the destination preserves U+1D48B.
- Use 𝒋 in an equation editor when mathematical spacing or structure matters.
- Define the local meaning when Bold Italic Small J is used in math alphanumeric with a field-specific convention.
Look-alikes and related characters
- = — Equals Sign
Font and compatibility notes
Font coverage varies; verify the code point and destination rendering before publication.
Continue the workflow
From Bold Italic Small J to a finished equation
- Copy the characterUse 𝒋 in plain text when Unicode is accepted.
- Choose a structured formatUse
𝒋for LaTeX or the MathML snippet for accessible web equations. - Edit or convertOpen the value in the editor or converter without retyping it.
Review and source notes
Quality tier: catalog
Last reviewed: 2026-07-23
Review method: Catalog review of character identity and notation mappings.
Verified against: Unicode Standard, Unicode mathematical notation guidance, and established LaTeX/MathML syntax.
Reference sources
- The Unicode StandardUnicode Consortium — Character identity, encoding, names, and conformance.
- Unicode Character Code ChartsUnicode Consortium — Code points and official character charts.
Frequently asked questions
What does the Bold Italic Small J symbol mean?
𝒋 is the Unicode character named mathematical bold italic small j. For Bold Italic Small J (𝒋), its mathematical meaning depends on the surrounding convention, alphabet style, or operator definition.
What is the LaTeX command for 𝒋?
Use 𝒋 in a compatible math environment.
Can I copy 𝒋 as Unicode?
Yes. Use the copy button above to copy the Unicode character directly.