amazon character set struggle?!

Stubled upon the Amazon search form and got curious about some seemingly useless hidden form value which is always equally set…

<form ... >
<input value="ÅMÅZÕÑ" name="__mk_de_DE" type="hidden" />
...

The only use I could make up for it would be (a really ingenious approach) that the receiving script could, by knowing what is supposed to be the value of this field, try to find issues in the transfered form encoding, so an automatic sanitation of the actually interesting part of the query – the search term – could be performed.

Boy, are they clever…

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