Canada has an 11-sided 1 dollar coin (the loonie) and a bimetallic 2 dollar coin (the toonie). This new £1 coin is basically a mash-up of the two.

Fair warning: People are going to put these things in pneumatic presses, hit them with sledge-hammers, etc. and then claim their brand new £1 coins are defective and "just fell apart". You should probably ignore these people. I'd be very surprised if the Royal Mint hadn't talked to the Canadian Mint and made sure they know how to make these things absolutely bomber.