Jason Karaian in Quartz:

For the numismatists, the new coin will mark Britain’s return to the dodecagonal fold. The design was inspired by the threepenny bit, which was used from 1937 to 1971. Polygonal coins in active circulation are relatively rare, phased out in the name of circular uniformity and found mostly as small-batch commemorative coins.

I couldn’t stop reading dodecagonal as dogecoin.