What is the function of the signage in indoor use?

In some parks, transportation, or other public occasions, we can see the use of signs and signs. In different occasions, they have different effects. Similarly, they are used indoors and have different functions when used outdoors. So, what are their functions in indoor use? In fact, the use of such signs indoors is to carry out floor guidance, or prompts and instructions for various rooms, such as direction guidance, Office guidance, or orientation map functions, etc. In this way, they have a better guiding effect for people indoors. This is also the reason why signs are installed in office buildings, conference buildings or other buildings.