I think the most important sign is "no smoking". There will be a cigarette and red cross out strip. This sign must be on the all streets of the world. The second sign is: "do not litter". The sign will have a trash and debris scattered and it will be crossed by red line. Вот тебе два, мне влом писать) завтра же выходной, напишешь потом
No Playing... No Dancing. No Swimming)))