Ravenclaw Crest is
Every crest makes use of the image of an animal, symbol of an element and the colours for each of the houses.
Rowena Ravenclaw as well as the crest of her house symbolises the element of air, which is used as the background of the crest. The colours of the Ravenclaw house are blue (background) and bronze (the animal). The animal used in the crest is an eagle which represents intelligence and wisdom; it "soars where others cannot climb" .
One of the very first (rejected) sketches of Ravenclaw crest was used to create the Montrose Magpies Quidditch Badge, which is a collectable object found in the last Chapter of Harry Potter and the Chamber of Secrets.