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[The Enigmatic Octothorpe and the Pitfalls of Sentence Fragments]-[The history of the octothorpe. Sir Fragalot and sentence fragments. Dribzle.]

Grammar Girl Quick and Dirty Tips for Better Writing · B2 · 2026-03-03

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📋 Summary

The Surprising Evolution of the Octothorpe

The ubiquitous symbol known as the "hashtag" carries a surprisingly complex history, often referred to by the grandiose and mysterious name, the Octothorpe. While North Americans frequently call it the "pound sign" and others simply the "hash," its origins are far more ancient. The symbol’s lineage can be traced back to ancient Rome and the unit of weight known as libra pondo. By the 14th century, scribes abbreviated this as "LB," eventually adding a horizontal stroke—a tittle—to denote omitted letters. Over time, careless handwriting caused these letters to blur into the crosshatch pattern we recognize today, a transformation visible in the manuscripts of Sir Isaac Newton.

In the 20th century, the symbol required a formal name for the Bell Telephone Laboratories' touch-tone systems. The term "Octothorpe" emerged from this necessity. Theories regarding its naming vary: some attribute it to a supervisor named Don McPherson, who combined "octo" (for the symbol's eight points) with "Thorpe" (a tribute to athlete Jim Thorpe). Others, such as engineer Doug Kerr, suggest it was a 1964 practical joke, while some link it to the archaic Old English word thorpe, meaning a small village. Regardless of its murky etymology, the symbol has evolved from a medieval scribal shorthand into a global digital icon, forever cemented by its role in social media as the "hashtag" after Chris Messina’s 2007 innovation.

Mastering the Art of Complete Sentences

Transitioning from typography to syntax, the podcast addresses the common struggle of maintaining grammatical integrity while pursuing brevity. Writers often fall into the trap of producing sentence fragments—word groups that lack the necessary components of a complete sentence. Using the persona of "Sir Fragalot," the host illustrates that simply capitalizing a word and adding a period does not constitute a valid sentence.

A complete sentence requires, at minimum, a subject and a verb (e.g., "Squiggly hurried"). The host identifies two exceptions where a single word suffices: exclamations (like "Ouch!") and imperatives (commands like "Run!"), where the subject is implied.

Crucially, having a subject and a verb does not guarantee a complete sentence if the phrase is a dependent clause. These clauses, often introduced by subordinating conjunctions like "because," "although," or "if," cannot stand alone. The host explains that adding "because" to "Squiggly hurried" turns a complete thought into a fragment: "Because Squiggly hurried." To resolve this, the fragment must be attached to a main clause, such as, "Aardvark was relieved because Squiggly hurried." By testing for verbs, identifying commands, and isolating subordinating conjunctions, writers can effectively purge fragments from their prose, ensuring their writing remains both concise and grammatically sound.

🎯Key Sentences

1
It's amazing.
2
It was brilliant, simple, and it completely changed how we organize information online.
3
Those of us over a certain age remember.
4
The grid worked fine for numbers one through nine.
5
And that's not even the end of it, because of course it isn't.
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📝Key Phrases

1
dig into
2
take off
3
talk past each other
4
born out of necessity
5
for what it's worth
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📖 Transcript

Grammar Girl here.
I'm Mignon Fogarty and today we're going to talk about the origin of the octothorpe and about sentence fragments.
But before we start, I have something really fun to share.
You might remember that a couple of weeks ago, I told you that snowboarding was originally called snurfing, combining the words snow and surfing.
Well, a listener named Dan found a video interview with the man who invented snurfing and it includes home videos of the first snurfing runs in his backyard.
It's amazing.

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