The symbol has to be original (not that well known or obvious). Symbols also do not have to be just one item ---- they can be a scenario or a series...

The symbol has to be original (not that well known or obvious). Symbols also do not have to be just one item ---- they can be a scenario or a series of items, e.g. the "destruction of wildlife" could be a scene depicting a field where flowers are dying one by one under a great orange fiery sun (the sun representing the intensity of those who wish to take wildlife for their own gain).