A symbol is something, such as a word or image, that stands for something else. For example, a heart shape could stand for love or Valentine's Day.
So to symbolize the Ibis, you are being asked to describe what or who the Ibis might stand for in the story. Try to think about the characterisitics of the Ibis and think about the story of The Scarlet Ibis. Does the Ibis remind you of anyone or anything in the story and why?
the use of symbols to represent ideas or qualities