In a
theatre, the wings are the area of
backstage that are at ground level on either
side of the
stage. It is where the
techies generally work, and where
scenery is stored, and
actors wait for their
cue to go on.
Hence the expression 'in the wings' (as opposed to 'in the
limelight') meaning someone who is working, unseen, but in just as
important a
role as someone who is in the
public eye.
If you're after any other theatre tech information, then do take a look at '
Everything you ever wanted to know about theatre tech, but were afraid to ask'