Atomic semiotics

Atomic semiotics (or nuclear semiotics) is an interdisciplinary field of semiotics which studies potential uses of long-term nuclear waste warning messages. It is concerned with labelling radioactive waste to deter human intrusion at nuclear waste repositories in the far future.
Elements of the message.
The message must contain three elements:
The message must also be credible. If it isn't credible it will be understood, but neglected; people will believe that this is done to protect an important treasure. These substances must be safe for 10.000s to millions of years.