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A circled question mark asking the author to resolve something.
Also known as: Author query, AQ, Circled question mark on a proof
A question mark, usually circled and often written 'au?'. It is not an instruction at all but a question, which makes it the one mark in the system that expects a reply rather than an action.
A question mark, generally circled and often accompanied by a note, raising a point for the author to resolve rather than instructing a change.
The only mark in the system that expects a reply rather than an action, which is why it is circled: circling in proof convention marks something not to be set as text.
Circling is a general convention in proof marking: a circled instruction or note is an instruction to the typesetter, not copy to be typeset. It applies to abbreviations like 'lc' and 'rom' as well as to queries.
A question mark drawn inside a circle in the margin, sometimes with a short handwritten note beside it.