Classification of signs:
Classified according to the form of signs: 1. Horizontal signs: The entire ratio is relatively long horizontally. Generally the entire surface is used as an advertising sign. It can generally be seen on the walls of small shops and large buildings. 2. Vertical sign: The entire ratio is relatively long vertically. Generally the entire surface is used as an advertising sign. 3. Protruding signs: protruding on the wall of the building, the entire surface except the back or both sides of the wall are used as signs for advertising carriers. 4. Columnar signs: horizontal, vertical, and three-dimensional signs marked on certain fixed structures on the ground. 5. Roof signs: refers to the installation of fixed structures on the roof of a certain building and hanging on them A board-shaped, cuboidal or magical sign that is attached or pasted.

According to the classification of sign materials:
1. Smooth signs: very smooth signs with oily screen or surface.
2. Luminous material signs: use luminous material signs (that is, what we usually call neon lights).
3. Acrylic signs (acrylic): Acrylic material is used as the main material of the board. 4. Metal signs: If there is no special designation of the plate surface, metal is used as the main material of the plate surface or text.
5. Electro-optic board: a sign that uses light-emitting diodes or luminous tubes to achieve monochrome or color performance. According to the light-emitting diode and the way of expression, it can be divided into five types: luminous panel, LCD, LED, CRT, FDT.

Classified according to the purpose of use of the sign:
1. Time difference: Illumination signs: For day and night use, install luminous tubes inside the signs, install light projectors inside, and install lights and other signs outside the signs. No lighting signs: There is no single purpose for day and night use, and no signs for lighting facilities.
2. Different locations: indoor signs: signs located indoors, such as direction arrow signs, indoor reception signs, etc. Outdoor signs: Signs located in all spaces other than indoors.
3. Different purposes: commercial signs: generally refer to signs set up for commercial purposes. Public signs: Signs set in public places to announce news to the public or to announce certain information.