In all the cultures of the world, we have various symbols which can relate to abundance and wealth generation. I will provide the following 3 items which are symbols of wealth and good luck.
It is also related to the net. In the times of the vikings, the net and the diet of fish is critical to them. Hence the ability to catch fish is very import and a form of wealth. the Salmon and the fish is very important to everyone.
you see all the money and affects of the rich in the picture.