"Mialheiro" is a slang word I invented from the word "mealheiro", which is how we say piggy bank or money box in portuguese. It has an "i" because it is a junction between the word "mealheiro" and the verb "miar" (portuguese verb for "meow"). It is composed by 3 different parts: the adapter for this specific jar, the cat face and 4 plugs to assemble these two together.