Traditional fingerpost signs usually consist of a cast iron post with black and white bands, and cast iron "fingers" giving directions.

BBC: Fingerpost sign

Archaeologists have also discovered the remains of a later Iron Age village which consists of a number of round houses defined by post holes in the ground.

BBC: Complete neolithic pot found in Didcot

Margaret Thatcher's conviction, her resolve, her iron self-belief led many to see her as Britain's post-war saviour - the woman who cured the so-called "British disease", tamed trade unions and vanquished the Argentine Junta in the South Atlantic.

BBC: Baroness Thatcher

Dr Post's system uses magnets made of an alloy of neodymium (a rarish metal), iron and boron.

ECONOMIST: Maglev trains