U+2401 "␁" Symbol for Start of Heading Unicode Character
Unicode Version 17.0
␁
U+2401 "␁" Symbol for Start of Heading is a graphic representation of the control character known as Start of Heading (SOH), which is typically invisible in standard text but used in data transmission protocols to mark the beginning of a message header. This symbol appears as a single uppercase "S" with a bar above it, indicating its role in separating the header from the body of a data stream. It belongs to the Control Pictures block of Unicode, which provides visible glyphs for non printing control characters to assist in debugging, documentation, and telecommunications contexts.
General Properties
| Code Point | U+2401 |
| Version Added | 1.1 |
| Name | Symbol for Start of Heading |
| Unicode 1.0 Name | Graphic for Start of Heading |
| Block | Control Pictures |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ␁ |
| HTML Hex Encoding | ␁ |
| UTF-8 Encoding | 0xE2 0x90 0x81 |
| UTF-16 Encoding | 0x2401 |
| UTF-32 Encoding | 0x00002401 |
| C/C++/Java Escape | \u2401 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Vertical Orientation | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |