U+2139 "ℹ" Information Source Unicode Character
Unicode Version 17.0
ℹ
U+2139 "ℹ" Information Source is a distinctive symbol typically rendered as a lowercase letter "i" enclosed within a circle, designed to indicate that additional information or context is available about a given topic. It is often used in user interfaces, signage, and documentation to direct users to a source of details, such as a help page or explanatory note, and is classified under the letterlike symbols block within the Unicode standard. Unlike its plain Latin counterpart, this character is intended as a standalone pictographic glyph rather than a typographic letter, and it carries a semantic function similar to a question mark or exclamation point for triggering informational queries.
General Properties
| Code Point | U+2139 |
| Version Added | 3.0 |
| Name | Information Source |
| Block | Letterlike Symbols |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "i" U+0069 Latin Small Letter I |
Encodings
| HTML Decimal Encoding | ℹ |
| HTML Hex Encoding | ℹ |
| UTF-8 Encoding | 0xE2 0x84 0xB9 |
| UTF-16 Encoding | 0x2139 |
| UTF-32 Encoding | 0x00002139 |
| C/C++/Java Escape | \u2139 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Lowercase | Yes |
| Cased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "i" U+0069 Latin Small Letter I |
| NFKC Simple Casefold | "i" U+0069 Latin Small Letter I |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Vertical Orientation | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Lower |
| Emoji | Yes |
| Extended Pictographic | Yes |