September 24th was National Punctuation Day. If interested, you can read more about it here: http://www.nationalpunctuationday.com/.
Punctuation is important to writing, whether it be a novel or a set of instructions on how to operate a new gadget. For example, does the panda eat, shoots, and leaves or does the panda eat shoots and leaves? There are even books devoted to punctuation: how to use it, when to use it, and even some about why to use it.
Though belated (Is there a punctuation mark for that?), below is a chart of some little known and rarely — if ever — used punctuation marks.