What's the name of a non-round coin?
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Klippe 
Wedges
Triangles
A klippe is a square coin minted on more easily produced square flans either using round or square dies. These coins were originally issued under unfavourable conditions, such as a city under siege. Such emergency coins were issued in Vienna in 1529, while the city was besieged by the troops of the Ottoman Empire. 
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