U+FEFF is a Unicode character with two meanings:
Byte order mark, previously used as zero-width no-break space Word joiner, Unicode character U+2060, a replacement for U+FEFF
FEFF may also refer to:
Bangui M'Poko International Airport, an airport in Central African Republic with the airport code FEFF. FEFF (software), a program used in X-ray absorption spectroscopy. Far East Film Festival, an annual film festival held in Udine, Italy.