␕
ASCII 21
ASCII Character
Negative Acknowledge
ASCII byte 21 (0x15) — Unicode U+0015. Standard ASCII is 0–127; extended bytes 128–255 use Windows-1252.
How to type ␕
Windows
- Copy ␕ with the Copy Symbol button above and paste it anywhere.
- In HTML, use  or hex .
- In JavaScript, use String.fromCharCode(21).
Mac
- Copy ␕ with the Copy Symbol button and paste it (fastest method).
- Open System Settings → Keyboard → Input Sources and add Unicode Hex Input (if needed).
- Select Unicode Hex Input from the menu bar input menu.
- Hold Option (⌥), type 0015 (from U+0015), then release Option.
- Or open Edit → Emoji & Symbols (or press Ctrl + Cmd + Space) and search for the character.
- In HTML on Mac editors, you can also paste .
Linux
- Copy ␕ with the Copy Symbol button and paste it.
- Press Ctrl + Shift + U, type 0015 (from U+0015), then press Enter or Space.
- On GNOME, you can also use Ctrl + . (or Ctrl + ;) to open the character picker.
- In HTML, use .
ASCII character details
| Parameter | Value | Copy |
|---|---|---|
| Symbol |
␕
|
|
| Symbol Name |
Negative Acknowledge
|
— |
| ASCII Decimal |
21
|
|
| ASCII Hex |
0x15
|
|
| Unicode Code |
U+0015
|
|
| HTML Decimal Code |

|
|
| HTML Hex Code |

|
|
| CSS Code |
\0015
|
|
| JavaScript Code |
\u0015
|
|
| Category |
ASCII Control Codes (0–31)
|
— |
FAQs about Negative Acknowledge ASCII Code Symbol
What is the ASCII code for Negative Acknowledge ASCII Code Symbol?
ASCII decimal 21, hex 0x15, Unicode U+0015.
How do I copy ␕?
Click Copy Symbol on this page to copy the character directly.
How do I type ASCII 21 in JavaScript?
Use String.fromCharCode(21) to output this character in JavaScript.
About this ASCII Character
ASCII byte 21 (0x15, U+0015) is negative acknowledge. Part of the complete standard ASCII table (0–127).
Tags: negative-acknowledge,ascii,extended-ascii,21,0×15,U+0015,ascii table,copy symbol