1164. This week, we look at the origin of the octothorpe — also known as the pound sign or hashtag — and why it has so many different names. Then, we look at sentence fragments and the secret of "Sir Fragalot" to help you avoid common writing mistakes.

A video of the man who invented snurfing.

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The octothorpe segment was written by Karen Lunde.

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The history of the octothorpe. Sir Fragalot and sentence fragments. Dribzle.

Grammar Girl: For Writers and Language Lovers.

The history of the octothorpe. Sir Fragalot and sentence fragments. Dribzle.