During the Nazi occupation of Norway in World War II, Norwegians made me a symbol of national unity. Wearing me on your clothes was sometimes enough reason for arrest.
What am I?
CLUE ONE: My creation and success had to wait for the invention of steel wire, which was flexible enough to be stretched, bent and twisted.
CLUE TWO: Before I came around, people used straight pins, string and other materials in my place as fasteners.
CLUE THREE: I hold papers together.
ANSWER: Paper Clip