Stall, as a symbol of exhibition industry, is in charge of visual and semantic events. The manifestation of  the  exhibition  industry  is  a  combination  of various specialized groups, each of which has an important role in this field. Everyone from hall owners, organizers, stall makers, equipment providers, news media and websites, tourism activists, security and safety authorities, authorities, medical urgency and etc. all ad all help in organizing an exhibition event in order to represent their latest methods and technologies.