This is the Unicode character ZERO WIDTH NO-BREAK SPACE, code point U+FEFF (decimal 65279) in the Arabic Presentation Forms-B block, added in Unicode 1.1. In HTML write , and in UTF-8 it is the 3 bytes EF BB BF.
Codes
| Where | How to write it |
|---|---|
| Code point | U+FEFF |
| Decimal | 65279 |
| UTF-8 bytes | EF BB BF |
| UTF-16 (big-endian) | FEFF |
| UTF-32 | 0000FEFF |
| HTML decimal |  |
| HTML hex |  |
| CSS | \FEFF |
| JavaScript | \uFEFF |
| JSON | \uFEFF |
| Python | \uFEFF |
| Python by name | \N{ZERO WIDTH NO-BREAK SPACE} |
| Java, C# | \uFEFF |
| Rust, Swift | \u{FEFF} |
| Go, C, C++ | \uFEFF |
| URL (percent-encoded) | %EF%BB%BF |
JavaScript and JSON strings store text as UTF-16, so this character is one code unit long. Python 3 strings count code points, so its length there is 1.
Properties
| Property | Value |
|---|---|
| Name | ZERO WIDTH NO-BREAK SPACE |
| Also known as | BYTE ORDER MARK |
| Code point | U+FEFF (decimal 65279) |
| Block | Arabic Presentation Forms-B (U+FE70–U+FEFF) |
| General category | Cf: Format character |
| Script | Common |
| Bidirectional class | BN: Boundary neutral |
| Mirrored in right-to-left text | No |
| First in Unicode version | 1.1 |
Nearby in Arabic Presentation Forms-B
- ﻵ U+FEF5 Arabic Ligature Lam With Alef With Madda Above Isolated Form
- ﻶ U+FEF6 Arabic Ligature Lam With Alef With Madda Above Final Form
- ﻷ U+FEF7 Arabic Ligature Lam With Alef With Hamza Above Isolated Form
- ﻸ U+FEF8 Arabic Ligature Lam With Alef With Hamza Above Final Form
- ﻹ U+FEF9 Arabic Ligature Lam With Alef With Hamza Below Isolated Form
- ﻺ U+FEFA Arabic Ligature Lam With Alef With Hamza Below Final Form
- ﻻ U+FEFB Arabic Ligature Lam With Alef Isolated Form
- ﻼ U+FEFC Arabic Ligature Lam With Alef Final Form
All 141 characters: Arabic Presentation Forms-B.
Official reference
Questions people ask
- What is the HTML code for ZERO WIDTH NO-BREAK SPACE?
- Use  (decimal) or  (hex).
- What is the UTF-8 encoding of U+FEFF?
- EF BB BF (hex), 3 bytes. In a URL it is %EF%BB%BF.
- How do I write U+FEFF in JavaScript or Python?
- JavaScript: \uFEFF. Python: \uFEFF.
Source
Unicode Character Database 18.0.0 (Unicode License v3); HTML entity names from the WHATWG HTML Standard (CC BY 4.0). The encodings above are computed from the code point and checked against Python's encoders. How the character looks depends on your fonts.
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