UnicodeCharactercom
NAK
U+0015 · NEGATIVE ACKNOWLEDGE

Negative Acknowledge

  • CodepointU+0015
  • NameNEGATIVE ACKNOWLEDGE
  • Decimal21
  • BlockBasic Latin (U+0000–U+007F)
  • Plane0 — Basic Multilingual Plane
  • ScriptCommon
  • CategoryCc — Control
  • Unicode version1.1 (1993)
  • Bidi classBN — Boundary Neutral
  • Combining class0
  • East Asian widthN — Neutral
  • MirroredNo

About this character

U+0015 is NEGATIVE ACKNOWLEDGE, a control character in the Basic Latin block. Its script is Common: it is shared by many writing systems rather than belonging to one. It was added in Unicode 1.1 (1993).

It is a control code inherited from ASCII. Unicode gives control codes no formal name, only the aliases NEGATIVE ACKNOWLEDGE, NAK.

Its visible stand-in is U+2415 ␕ in the Control Pictures block.

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Encodings & escapes

UTF-8 encoder →
UTF-8151 byte
UTF-1600151 code unit
UTF-32000000154 bytes
CSS\15in content: "…"
JavaScript\u0015
JSON\u0015
Python\u0015
Python\N{NEGATIVE ACKNOWLEDGE}by name
Java / C#\u0015
Rust / Swift / PHP\u{15}
Go\u0015
Ruby\u0015
URL-encoded%15percent-encoded UTF-8
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Nearby in Basic Latin

All in block →
U+000FSIShift in U+0010DLEData Link Escape U+0011DC1Device Control One U+0012DC2Device Control Two U+0013DC3Device Control Three U+0014DC4Device Control Four U+0016SYNSynchronous Idle U+0017ETBEnd of Transmission Block U+0018CANCancel U+0019EOMEnd of Medium U+001ASUBSubstitute U+001BESCEscape