U+2406 "␆" Symbol for Acknowledge Unicode Character
Unicode Version 17.0
␆
U+2406 "␆" Symbol for Acknowledge is a graphic representation used primarily in data communications and teleprinter protocols to denote the control character Acknowledge, often abbreviated as ACK. Part of the Control Pictures block in Unicode, this symbol visually illustrates the function of acknowledging receipt of a message or signal, typically indicating that data has been received without error in systems like ASCII transmission standards. Its design usually features an overlapping or stylized shape that conveys a sense of confirmation or recognition, making it a clear reference for technical documentation, debugging logs, or schematic diagrams where real control characters cannot be displayed.
General Properties
| Code Point | U+2406 |
| Version Added | 1.1 |
| Name | Symbol for Acknowledge |
| Unicode 1.0 Name | Graphic for Acknowledge |
| 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 0x86 |
| UTF-16 Encoding | 0x2406 |
| UTF-32 Encoding | 0x00002406 |
| C/C++/Java Escape | \u2406 |
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 |