U+1D422𝐢𝐢<mi>𝐢</mi>Semantic identity and intent
Characters to distinguish
- = — Equals Sign
Use 𝐢 in the right format
Meaning and usage
𝐢 is the Unicode character named mathematical bold small i. For Bold Small I (𝐢), its mathematical meaning depends on the surrounding convention, alphabet style, or operator definition.
Use 𝐢 when the source convention requires this exact character. For Bold Small I (𝐢), define styled letters and specialized glyphs explicitly, because visually similar Unicode characters may not be semantically interchangeable.
Pronunciation: bold small i
Formula examples
𝐢 = xf(𝐢)How to type Bold Small I
- Windows
- Use Character Map or enter Unicode 1D422 in a Unicode-aware application.
- macOS
- Open Character Viewer and search for mathematical bold small i.
- Microsoft Word
- Type 1D422, then press Alt+X in Microsoft Word where supported.
- iPhone and iPad
- Copy and paste 𝐢, or use a math/LaTeX app. The standard iOS keyboard may not expose every mathematical symbol.
- Android
- Copy and paste 𝐢, or use a math keyboard or LaTeX editor. Keyboard layouts vary by device and app.
- Google Docs
- For plain text, paste 𝐢 or use Insert → Special characters. For structured math, use the equation editor and verify 𝐢.
- Excel
- Paste 𝐢 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 𝐢; case and mathematical alphabet style can identify different quantities.
- For plain text, copy 𝐢 as U+1D422; for structured equations, use 𝐢 in math mode. A look-alike glyph or image can break search, accessibility, or parsing when the intended character is Bold Small I.
When to use 𝐢
- Use 𝐢 in plain text when a Unicode character is appropriate and the destination preserves U+1D422.
- Use 𝐢 in an equation editor when mathematical spacing or structure matters.
- Define the local meaning when Bold Small I 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 Small I to a finished equation
- Copy the characterUse 𝐢 in plain text when Unicode is accepted.
- Choose a structured formatUse
𝐢for 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 Small I symbol mean?
𝐢 is the Unicode character named mathematical bold small i. For Bold Small I (𝐢), its mathematical meaning depends on the surrounding convention, alphabet style, or operator definition.
What is the LaTeX command for 𝐢?
Use 𝐢 in a compatible math environment.
Can I copy 𝐢 as Unicode?
Yes. Use the copy button above to copy the Unicode character directly.