NAK
NAK Negative-acknowledge
ASCII Code: 21•Category: control
Technical Details
- ASCII Code
- 21
- HTML Entity
- 
- Hexadecimal
- 0x15
- Binary
- 00010101
- Octal
- 25
Usage & Examples
Programming
char symbol = 'NAK'; // ASCII 21HTML/Web
 or NAKCommon Uses
nakcontrol
How to Type This Character
Windows
Alt Code:
Hold Alt and type21 on numeric keypad
Character Map:
Search "Character Map" in Start menu
Mac
Character Viewer:
Press Ctrl +Cmd +Space
Copy & Paste:
Easiest method - copy from this page!
💡 Pro tip: The fastest way is to bookmark this page or copy the character from our ASCII library!
Related Characters
About the NAK Negative-acknowledge
The NAK Negative-acknowledge (NAK) is an ASCII character with code 21. This control symbol is commonly used in nak, controland other applications. You can easily copy this character by clicking the button above.
This character is part of the standard ASCIIcharacter set and is widely supported across different platforms and applications. Use it in documents, code, social media posts, and anywhere you need the nak negative-acknowledge symbol.