In modern cities, signs and signs have been mixed in many occasions, but there are obvious differences in the scope of meaning when they are used. The term "sign" refers to a category of graphics or symbols combined with graphics and words as the representation of a certain category of things."Logo" can represent the symbol of graphic class, but also used to express words, Numbers, marks such as directional signs, has a wider range of use, it should be said that the logo is a part of the logo.