assignment -- sign:

Create a sign expressing a prohibition of some kind. You may choose from:

  • don't talk during lectures
  • don't unplug a particular USB device
  • don't start two (particular) applications simultaneously

For example, a don't spit on the street campaign was held in China, during the outburst of SARS. This resulted in signs, similar to non-parking or no-smoking signs.
Literature: 1000 signs, Taschen Verlag