Lately I've started wondering about the ¤ character which is shift+4 on my Norwegian keyboard (it's also present on several others, including the U.S. International keyboard layout). I've never seen a use for it, yet for some reason someone decided it was important enough to have it put in such a central place on the keyboard. What is this character called, and what purpose does it have?
This is the currency sign
Also from Currency (typography):