The “A Word A Day” mailing list reminded me of something one of the guys I used to work with would joke about when the C# team first came up with their name. The sharp symbol goes by many names, the strangest of which has to be “octothorpe.” (Just click on the link and search for “octo” to find the entry.)
I realize that I’m hardly the first person to mention this, but I’d never seen such an exhaustive discussion of the etymology of the word. Or a list of all the other names that # goes by. C hak? C gridlet? C square?