1. Representational form: The natural form that is basically faithful to objective images. After refining, summarizing and attaining, it highlights and exaggerates its essential features as a symbolic figure. This form has easy-to-identify features.
2. Image form: The form of an object image as a basic idea, in the form of decorative, abstract graphics or textual symbols. For example, the symbol of the Chinese Civil Aviation is expressed in the form of an abstract figure. This form tends to be more artistic and modern.
3. Abstract form: A form expressed in completely abstract geometry, text, or symbols. This graphic often has a profound abstract meaning, symbolic meaning, or mystery. For example, the logo of the Lenovo Group symbolizes a vast and far-reaching association space by using geometric figures in the set of gardens. There may also be no more profound meaning of only the characteristics of the table, such as the exaggeration of the English name (or Pinyin words) prefix. This form tends to have a more intense sense of modernity and symbolism and is easy to remember.