Half a croissant, on a plate, with a sign in front of it saying '50c'
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Thirteen Sided Guinea Coin

Thirteen sided coin. That's about it. Not much more to it than that.
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The thrippeny bit is upon us again, here in the U of K, as of tomorrow (today, if you're reading this tomorrow) a few lucky people are apparently going to have a twelve sided coin foist upon us (again), if you were in line to actually get any money at all, that is.

I suggest they missed an interesting experiment. Instead of (or as well as) (or to one side of) a twelve sided £1, we should have a coin that translates to thirteen ten pences, and call it a guinea (which has an interesting history itself). It should have thirteen sides around the perimeter (the edge) (I'm not including the two faces of the coin - obverse and reverse, which complicates things - ie, claiming the new £1 coin has fourteen sides just makes you look a twat).

Ian Tindale, Mar 27 2017

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       I'm not sure; a thirteen-sided coin would look odd.
(Isn't the 50p coin 9-sided or something?)
neutrinos_shadow, Mar 27 2017
  

       6œ sides
FlyingToaster, Mar 27 2017
  

       It's obvious, really, that all coins should be rectangular, with edge ratios similar to A4 paper. This would mean that two 50p coins could be placed side by side to make a £1 coin. Two 25p coins could be placed side by side to make a 50p, and so on through the 12.5p coin, the 6.25p coin, the 3.125p coin and so on.   

       Obviously, there would be £2 note with an area equal to two side-by-side £1 coins, a £4 note, etc etc.   

       In fact, with some clever perforations and bit of fractality, you could split a £4 note into two £2 notes.
MaxwellBuchanan, Mar 27 2017
  

       Still can't understand why I can't print my own salary, it's only the god-dammed issue number that counts...
not_morrison_rm, Mar 27 2017
  

       As far as I'm concerned, all coinage should be platonic solids.
Cuit_au_Four, Mar 27 2017
  

       As I understand it, the 50p and 20p coins have an odd number of sides because each side is not flat, it's a curve of constant distance to the opposite corner. As a result the coins have the same diameter no matter what angle you measure it, which means they can roll through vending machine mechanisms easily.   

       If the new coin has an even number of sides, it can't have this property. 13 sides would make a lot more sense.
mitxela, Mar 28 2017
  

       //If the new coin has an even number of sides, it can't have this property.// That is an interesting observation, of which I was not aware. Thank you.
MaxwellBuchanan, Mar 28 2017
  

       Much like the Reuleaux triangle of a Wankel engine, the epitrochoidal shape of an epitrochoid, such as the 50p coin, is within the set of constant width shapes.
Ian Tindale, Mar 28 2017
  

       Made of nickel, copper, silver, gold, or gold pressed latinum ?
popbottle, Mar 28 2017
  

       The pound coin was one of the worst designed items in modern times. It was universally and rightly detested. Let's hope its replacement is better, as it could never be worse. In America, the equivalent dollar coin is also a failure but at least there, people were smart enough to simply boycott it, ensuring the perpetuation of the most excellent single dollar note.
xenzag, Mar 28 2017
  

       Dollar bills are loathsome things. Aside from being too small to be of much use (yet somehow accumulating in wallets and pockets like so much lint), they are just plain pug uggerly.
MaxwellBuchanan, Mar 28 2017
  

       Sovereigns are currently circulating and legal tender and with a fixed size and shape with their traditional face value of £1.   

       I think you mean a guinea.
pocmloc, Mar 31 2017
  

       Good point. Guineas are interesting in that they clearly defy the category set that they're trying to be shoehorned into. They were the first machine struck gold coin, here, and they were originally one pound sterling, but gold price increases pushed the face value up away from that. That must've been a strange set of circumstances and outcomes to have lived through.   

       I shall change the title of this idea to that, then. Thanks.
Ian Tindale, Mar 31 2017
  

       I rather like the US dollar coin (the "Susan B Anthony"). I remember it was always possible to get a supply of them as change from the stamp vending machines in post offices. Shop-owners were sometimes grumpy about accepting them because there wasn't a place in the till for them. Likewise, I have a friend with a large collection of $2 bills, which he spends occasionally, just to surprise shopkeepers.
hippo, Mar 31 2017
  

       Actually, the new 1 quid is 27-sided, the other 15 sides are inside the coin, making it virtually impossible to counterfeit.
not_morrison_rm, Mar 31 2017
  

       I've never met any American that likes the dollar coin. They are universally detested. I adore the dollar bill. There is nothing better than porting around a wadge of singles secured together with an elastic band. I particularly like the dirty ones, often characterised by suspicious looking stains.... could that be blood?   

       When the rotten pound coins came in, I used to drill a small hole through every one I collected on a weekly basis. These clunky bolloxes must be the worst coins ever to have come into existence. The Euro coins are actually no better, only not quite as heavy. I hate them too. Everyone does. Why is it so hard for the numpties that "design" such products to create something that is actually well designed? grrrrrrr coin rant!!! and now I'm going to hug next door's cat.
xenzag, Mar 31 2017
  

       Oh, lucky cat.
Ian Tindale, Mar 31 2017
  

       Sierpinski coins. Just think of how many you could make out of one gram of gold.
RayfordSteele, Mar 31 2017
  
      
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