If you've ever wondered what the hell a Pilcrow (¶) is, Shady Characters gives a comprehensive history:
The pilcrow is not just some typographic curiosity, useful only for livening up a coffee-table book on graphic design or pointing the way to a paragraph in a mortgage deed, but a living, breathing character with its roots in the earliest days of punctuation. Born in ancient Rome, refined in medieval scriptoria, appropriated by England's most famous modern typographer and finally rehabilitated by the personal computer, the story of the pilcrow is intertwined with the evolution of modern writing. It is the quintessential shady character.
The whole thing is worth reading, especially for typography enthusiasts.