Hi,
U+FEFF Byte Order Mark. Hat dort nichts zu suchen.
However, if encountered elsewhere [i.e. not at start of file, Anmerkung von MudGuard] it should, according to Unicode, be treated as a "zero-width non-breaking space." (allerdings seit Unicode 3.2 deprecated -> use U+2060 Word Joiner instead ...)
(sagt zumindest Wikipedia)
cu,
Andreas a/k/a MudGuard