const.id

unicode

U+FEFF

ZERO WIDTH NO-BREAK SPACE

ZERO WIDTH NO-BREAK SPACE · Format · Arabic Presentation Forms-B · Common script

formatinvisibledefault-ignorable

Quick facts

Code point
U+FEFF
Decimal
65279
Name
ZERO WIDTH NO-BREAK SPACE
General category
Cf — Format
Block
Arabic Presentation Forms-B
Script
Common
Bidi class
BN
Combining class
0
Age
1.1
Name aliases
BYTE ORDER MARK (alternate), BOM (abbreviation), ZWNBSP (abbreviation)

Normalization & case

Decomposition
—
Uppercase
—
Lowercase
—
Titlecase
—
Case folding
—
Bidi mirrored
No

Layout & width

East Asian Width
N
Line Break
WJ
Numeric
—
Script extensions
—

Binary properties

Default_Ignorable_Code_Point

Developer examples

JS
'\u{feff}' // U+FEFF
Python
"\N{ZERO WIDTH NO-BREAK SPACE}"
HTML


Encodings & escapes

UTF-8
UTF-16
UTF-32
HTML decimal
HTML hex
JavaScript
Python
CSS
JSON
URL (UTF-8)
C / C++

Warnings

  • This character may be invisible or format-only in many fonts and editors.
  • Default ignorable: renderers may hide this character.
  • Often involved in invisible text, bidi tricks, or identifier confusion — handle carefully.

Related

Block

Arabic Presentation Forms-B

Category

Format

Script

Common

Source

Unicode
16.0.0
WHATWG
—