The main purpose of signs is to communicate, to convey information such that the receiver may make cognitive decisions based on the information provided. In general, signs may be classified according to the following functions:
Information: signs conveying information about services and facilities, such as maps, directories, or instructional signs.
Direction: signs showing the location of services, facilities, functional spaces and key areas, such as sign posts or directional arrows.
Identification: signs indicating services and facilities, such as room names and numbers, restroom signs, or floor designations.
Safety and Regulatory: signs giving warning or safety instructions, such as warning signs, traffic signs, exit signs, or signs conveying rules and regulations.