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> Also pictures commonly have universal meanings

Not really. Here's a common example

This pictures means different things in different cultures.

Something else http://www.ritex.it/images/20111116_A.jpg Try asking a Chinese farmer what this is.

Try asking an American what this picture means -

Most people would know that means "exit" but in true American fashion the United States uses a different sign - http://www.oneskilladay.com/wp-content/uploads/2013/05/Exit-...

I gotta say it took me a long time abroad to figure out what the green running man sign meant.