The final bar in the flute part of an orchestra piece has a notation I've never seen and can't find an explanation for. I thought the small circle might denote an overtone but I'm not sure. And the half bracket I've only seen in piano notations. Anybody know what I'm supposed to play?
It's almost certainly sloppy music preparation. It looks very much like there is an octave sign over the notes with an extension line with a hook at the showing the end of the 8va passage, but it's so low that the '8' has merged with the note. Looking at the measure before and the dynamic supports this: it would be logical for both parts to go up for the last measure.