U+FEFF ZERO WIDTH NO-BREAK SPACE

The Unicode character U+FEFF, officially named ZERO WIDTH NO-BREAK SPACE, was introduced in Unicode version 1.1. It is part of the Arabic PF B block, which belongs to the Basic Multilingual plane. Previously, it was also referred to as BYTE ORDER MARK.

Categorized technically as a Format, this character typically falls under the Common script. In terms of text layout and rendering, the glyph is not a composition and has no designated width in East Asian typography. When placed in bidirectional text, it behaves as an Unknown character. Its visual representation remains not mirrored regardless of the reading direction.