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emelski

Neither did I, so I looked it up:

http://en.wikipedia.org/wiki/Radiation_symbol#Radioactive_si...

In fact, the symbol is so completely unintuitive that ISO came up with a new version:

http://upload.wikimedia.org/wikipedia/en/1/10/New_radiation_...

... which to me certainly does connote "these rocks shoot death rays!" as well as the sage advice "RUN!"

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The new version could also be interpreted as saying 'the breeze from ceiling fans can reanimate the dead'...

Agreed. It would make much more sense rearranged like this http://oi51.tinypic.com/15hzdcj.jpg

You know, that makes me think - arrows seem totally obvious to us, but would they be obvious to someone from a completely different culture? <- could be 'go this way'; it could also mean 'avoid as if it's the mouth of a crocodile'.

Well as they said above, to dig that deep the civilization needs a non trivial technology, so I would think any human with an index finger would get it (but the problem remains for those who don't have fingers).

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