AES Encryption Explained: How It Works and Why It Matters
Jun 23, 2026
HTML Entity Detail
HTML Entity - Black Letter Capital I
Black Letter Capital I is a letterlike mathematical symbols representing number sets and special functions. This HTML entity enables web developers to display this character reliably across all browsers without encoding issues.
Symbol preview
ℑ
Unicode
U+2111
HTML entity
ℑ
CSS code
\2111
Usage Examples
Use this HTML entity in mathematical notation for number sets like ℝ (real numbers) and ℕ (natural numbers), and physics constants.
Related Entities
Common Mistakes
⚠️
Mistake: Using plain Latin letters instead of double-struck symbols for number sets
Fix: Use ℝ (ℝ), ℕ (ℕ), ℤ (ℤ), ℂ (ℂ) for number sets. Plain R, N, Z, C are ambiguous and less formal in mathematical writing.
⚠️
Mistake: Confusing the aleph symbol ℵ with a Hebrew letter or a stylized N
Fix: The aleph symbol ℵ is specifically used in set theory for transfinite cardinal numbers (ℵ₀). It is not a decorative character or a substitute for the Hebrew letter.
Black Letter Capital I
Select any code to highlight it before copying.
Category: Letterlike Symbols
| Unicode | U+2111 |
|---|---|
| Hex Code | ℑ |
| HTML Code | ℑ |
| HTML Entity | ℑ |
| CSS Code | \2111 |
| Windows Shortcut | |
| Mac Shortcut | |
HTML code example
CSS code example
Last updated: 21 Jun 2026
Blog
Latest from Our Blog
CSS Gradient Generator: Create Stunning Gradients for Your Website
Jun 23, 2026
Diff Checker: How to Compare Text and Files Effectively
Jun 23, 2026
JSON Validation: How to Validate and Fix JSON Data
Jun 23, 2026
Regex Testing: How to Test and Debug Regular Expressions
Jun 23, 2026
SSL Certificate Checker: How to Verify SSL/TLS Certificates Online
Jun 23, 2026