Riconoscimento negativo
Significato del simbolo
The Negative Acknowledgement symbol was used in computer terminals, printers, text processing systems, and telecommunication equipment to control data flow and ensure the reliable transmission of information.
It tended to indicate an error in data transmission or a problem with receiving information. In communication protocols, after receiving the NAK symbol, the data sender was required to repeat the previous transmission to correct any errors or data loss. If the data was transmitted correctly, the opposite symbol was sent ( ).
As for modern computer systems and applications, the U+0015 symbol is rarely used there, since other mechanisms and protocols are employed to ensure the reliability of data transmission and error handling.
Like many other control symbols, this one has no visible representation and doesn't occupy a lot of space on screen or in typed text. However, there is a separate symbol in Immagini di controllo 2400–243F representing the graphical image of the Negative Acknowledge symbol as the abbreviation NAK — ␕ .
Il simbolo «Riconoscimento negativo» è incluso nel sotto-blocco «Controlli C0‘ del blocco ’Latino di base ed è stato approvato come parte della versione Unicode 1.1 nel 1993.
Sinonimi
NAK.
| Nome Unicode | Negative Acknowledge |
| Numero Unicode | |
| Piano | 0: Piano multilingua principale |
| Blocco Unicode | Latino di base |
| Sottoblocco Unicode | Controlli C0 |
| Versione Unicode | 1.1 (1993) |
| Scorciatoia da tastiera | ^U |
| Tipo di supporto specchio accoppiato (bidi) | None |
| Esclusione della composizione | No |
| Cambio di caso | 0015 |
| Semplice cambio di caso | 0015 |
| scripts | Common |
| Codifica | hex | dec (bytes) | dec | binary |
|---|---|---|---|---|
| UTF-8 | 15 | 21 | 21 | 00010101 |
| UTF-16BE | 00 15 | 0 21 | 21 | 00000000 00010101 |
| UTF-16LE | 15 00 | 21 0 | 5376 | 00010101 00000000 |
| UTF-32BE | 00 00 00 15 | 0 0 0 21 | 21 | 00000000 00000000 00000000 00010101 |
| UTF-32LE | 15 00 00 00 | 21 0 0 0 | 352321536 | 00010101 00000000 00000000 00000000 |
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