The sign you mentioned is called "Restricted stopping prohibition in the middle." This sign indicates that stopping is prohibited in the marked area. It is typically placed on the right side and is aimed at preventing vehicles from stopping in specific locations where it may cause obstruction or safety hazards, such as near intersections, pedestrian crossings, or other critical areas.

Drivers must not stop their vehicles within the limits marked by this sign, which helps to maintain the smooth flow of traffic and enhance safety for all road users. If you have any further questions about this sign or related traffic rules, feel free to ask!