The penning's name is based off the old english word penig
The deci is equivalent to a dime and there are no nickel equivalents
The dium is based on the latin word dimidium meaning half
The thal would most likley be made of bismuth
The reverse of the penning has a ladybug design
The deci has a bumble bee on the back of it
The dium has a moth design on the back
The thal has a design of a larder beetle, the nation insect of Ardaria