U+0015 Negative Acknowledge *
U+0015 was added in Unicode version 1.1 in 1993. It belongs to the block Basic Latin in the Basic Multilingual Plane.
This character is a Control and is commonly used, that is, in no specific script. The character is also known as NEGATIVE ACKNOWLEDGE.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Boundary Neutral. When changing direction it is not mirrored. U+0015 prohibits a line break before it.
The Wikipedia has the following information about this codepoint:
In data networking, telecommunications, and computer buses, an acknowledgement (ACK) is a signal that is passed between communicating processes, computers, or devices to signify acknowledgment, or receipt of message, as part of a communications protocol. Correspondingly a negative-acknowledgement (NAK or NACK) is a signal that is sent to reject a previously received message or to indicate some kind of error. Acknowledgments and negative acknowledgments inform a sender of the receiver's state so that it can adjust its own state accordingly.
Representations
| System | Representation |
|---|---|
| Nº | 21 |
| UTF-8 | 15 |
| UTF-16 | 00 15 |
| UTF-32 | 00 00 00 15 |
| URL-Quoted | %15 |
| HTML hex reference |  |
| Wrong windows-1252 Mojibake | â• |
| Caret Notation | ^U |
| control | NEGATIVE ACKNOWLEDGE |
| abbreviation | NAK |
| alias | NEGATIVE ACKNOWLEDGE |
| Encoding: ASCII (hex bytes) | 15 |
| Encoding: BIG5 (hex bytes) | 15 |
| Encoding: BIG5HKSCS (hex bytes) | 15 |
| Encoding: CP037 (hex bytes) | 3D |
| Encoding: CP273 (hex bytes) | 3D |
| Encoding: CP424 (hex bytes) | 3D |
| Encoding: CP437 (hex bytes) | 15 |
| Encoding: CP500 (hex bytes) | 3D |
| Encoding: CP720 (hex bytes) | 15 |
| Encoding: CP737 (hex bytes) | 15 |
| Encoding: CP775 (hex bytes) | 15 |
| Encoding: CP850 (hex bytes) | 15 |
| Encoding: CP852 (hex bytes) | 15 |
| Encoding: CP855 (hex bytes) | 15 |
| Encoding: CP856 (hex bytes) | 15 |
| Encoding: CP857 (hex bytes) | 15 |
| Encoding: CP858 (hex bytes) | 15 |
| Encoding: CP860 (hex bytes) | 15 |
| Encoding: CP861 (hex bytes) | 15 |
| Encoding: CP862 (hex bytes) | 15 |
| Encoding: CP863 (hex bytes) | 15 |
| Encoding: CP864 (hex bytes) | 15 |
| Encoding: CP865 (hex bytes) | 15 |
| Encoding: CP866 (hex bytes) | 15 |
| Encoding: CP869 (hex bytes) | 15 |
| Encoding: CP874 (hex bytes) | 15 |
| Encoding: CP875 (hex bytes) | 3D |
| Encoding: CP932 (hex bytes) | 15 |
| Encoding: CP949 (hex bytes) | 15 |
| Encoding: CP950 (hex bytes) | 15 |
| Encoding: CP1006 (hex bytes) | 15 |
| Encoding: CP1026 (hex bytes) | 3D |
| Encoding: CP1125 (hex bytes) | 15 |
| Encoding: CP1140 (hex bytes) | 3D |
| Encoding: CP1250 (hex bytes) | 15 |
| Encoding: CP1251 (hex bytes) | 15 |
| Encoding: CP1252 (hex bytes) | 15 |
| Encoding: CP1253 (hex bytes) | 15 |
| Encoding: CP1254 (hex bytes) | 15 |
| Encoding: CP1255 (hex bytes) | 15 |
| Encoding: CP1256 (hex bytes) | 15 |
| Encoding: CP1257 (hex bytes) | 15 |
| Encoding: CP1258 (hex bytes) | 15 |
| Encoding: EUC_JP (hex bytes) | 15 |
| Encoding: EUC_JIS_2004 (hex bytes) | 15 |
| Encoding: EUC_JISX0213 (hex bytes) | 15 |
| Encoding: EUC_KR (hex bytes) | 15 |
| Encoding: GB2312 (hex bytes) | 15 |
| Encoding: GBK (hex bytes) | 15 |
| Encoding: GB18030 (hex bytes) | 15 |
| Encoding: HZ (hex bytes) | 15 |
| Encoding: ISO2022_JP (hex bytes) | 15 |
| Encoding: ISO2022_JP_1 (hex bytes) | 15 |
| Encoding: ISO2022_JP_2 (hex bytes) | 15 |
| Encoding: ISO2022_JP_2004 (hex bytes) | 15 |
| Encoding: ISO2022_JP_3 (hex bytes) | 15 |
| Encoding: ISO2022_JP_EXT (hex bytes) | 15 |
| Encoding: ISO2022_KR (hex bytes) | 15 |
| Encoding: LATIN_1 (hex bytes) | 15 |
| Encoding: ISO8859_2 (hex bytes) | 15 |
| Encoding: ISO8859_3 (hex bytes) | 15 |
| Encoding: ISO8859_4 (hex bytes) | 15 |
| Encoding: ISO8859_5 (hex bytes) | 15 |
| Encoding: ISO8859_6 (hex bytes) | 15 |
| Encoding: ISO8859_7 (hex bytes) | 15 |
| Encoding: ISO8859_8 (hex bytes) | 15 |
| Encoding: ISO8859_9 (hex bytes) | 15 |
| Encoding: ISO8859_10 (hex bytes) | 15 |
| Encoding: ISO8859_11 (hex bytes) | 15 |
| Encoding: ISO8859_13 (hex bytes) | 15 |
| Encoding: ISO8859_14 (hex bytes) | 15 |
| Encoding: ISO8859_15 (hex bytes) | 15 |
| Encoding: ISO8859_16 (hex bytes) | 15 |
| Encoding: JOHAB (hex bytes) | 15 |
| Encoding: KOI8_R (hex bytes) | 15 |
| Encoding: KOI8_T (hex bytes) | 15 |
| Encoding: KOI8_U (hex bytes) | 15 |
| Encoding: KZ1048 (hex bytes) | 15 |
| Encoding: MAC_CYRILLIC (hex bytes) | 15 |
| Encoding: MAC_GREEK (hex bytes) | 15 |
| Encoding: MAC_ICELAND (hex bytes) | 15 |
| Encoding: MAC_LATIN2 (hex bytes) | 15 |
| Encoding: MAC_ROMAN (hex bytes) | 15 |
| Encoding: MAC_TURKISH (hex bytes) | 15 |
| Encoding: PTCP154 (hex bytes) | 15 |
| Encoding: SHIFT_JIS (hex bytes) | 15 |
| Encoding: SHIFT_JIS_2004 (hex bytes) | 15 |
| Encoding: SHIFT_JISX0213 (hex bytes) | 15 |
| Encoding: CP037 (hex bytes) | 3D |
| Encoding: CP1025 (hex bytes) | 3D |
| Encoding: CP1047 (hex bytes) | 3D |
| Encoding: CP1097 (hex bytes) | 3D |
| Encoding: CP1112 (hex bytes) | 3D |
| Encoding: CP1122 (hex bytes) | 3D |
| Encoding: CP1123 (hex bytes) | 3D |
| Encoding: CP1140 (hex bytes) | 3D |
| Encoding: CP1141 (hex bytes) | 3D |
| Encoding: CP1142 (hex bytes) | 3D |
| Encoding: CP1143 (hex bytes) | 3D |
| Encoding: CP1144 (hex bytes) | 3D |
| Encoding: CP1145 (hex bytes) | 3D |
| Encoding: CP1146 (hex bytes) | 3D |
| Encoding: CP1147 (hex bytes) | 3D |
| Encoding: CP1148 (hex bytes) | 3D |
| Encoding: CP1148MS (hex bytes) | 3D |
| Encoding: CP1149 (hex bytes) | 3D |
| Encoding: CP273 (hex bytes) | 3D |
| Encoding: CP277 (hex bytes) | 3D |
| Encoding: CP278 (hex bytes) | 3D |
| Encoding: CP280 (hex bytes) | 3D |
| Encoding: CP284 (hex bytes) | 3D |
| Encoding: CP285 (hex bytes) | 3D |
| Encoding: CP290 (hex bytes) | 3D |
| Encoding: CP297 (hex bytes) | 3D |
| Encoding: CP420 (hex bytes) | 3D |
| Encoding: CP424 (hex bytes) | 3D |
| Encoding: CP500 (hex bytes) | 3D |
| Encoding: CP500MS (hex bytes) | 3D |
| Encoding: CP833 (hex bytes) | 3D |
| Encoding: CP838 (hex bytes) | 3D |
| Encoding: CP870 (hex bytes) | 3D |
| Encoding: CP871 (hex bytes) | 3D |
| Encoding: CP875 (hex bytes) | 3D |
| Adobe Glyph List | controlNAK |
| digraph | NK |
Elsewhere
Complete Record
| Property | Value |
|---|---|
| 1.1 (1993) | |
| — | |
| NEGATIVE ACKNOWLEDGE | |
| Basic Latin | |
| Control | |
| Common | |
| Boundary Neutral | |
| Not Reordered | |
| none | |
| Negative Acknowledge* | |
| ✘ | |
| Negative Acknowledge* | |
| Negative Acknowledge* | |
| ✘ | |
| Negative Acknowledge* | |
| Negative Acknowledge* | |
| Negative Acknowledge* | |
| Negative Acknowledge* | |
| Negative Acknowledge* | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Negative Acknowledge* | |
| Control | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| 0 | |
| 0 | |
| 0 | |
| ✘ | |
| None | |
| — | |
| NA | |
| Other | |
| — | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Yes | |
| Yes | |
| Negative Acknowledge* | |
| Yes | |
| Negative Acknowledge* | |
| Yes | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Other | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| ✘ | |
| Negative Acknowledge* | |
| None | |
| neutral | |
| Not Applicable | |
| — | |
| No_Joining_Group | |
| Non Joining | |
| Combining Mark | |
| none | |
| not a number | |
| Negative Acknowledge* | |
| R |