What are those metal S thingies on lots of old English cottages?

This has been bugging me for so long, and google has not been able to help in the slightest. I live in Cambridge, UK, and see many old cottages and historical buildings with these on their walls (often on the facade), in groups of 4/5.

What are they? Do they serve a purpose or are they simply decorative? What’s their story?

Thank you in advance, and sorry for the somewhat odd question!

submitted by /u/accordioner
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from Architecture http://ift.tt/2xWB0mY

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