The hashtag is actually an ancient Roman weight measurement
In short: Before it lived on social media feeds, the octothorpe (#) was a practical shorthand for commerce. Its journey from a Latin abbreviation to a digital symbol reveals how we have spent centuries refining the visual cues that separate our thoughts and organize our information.
The evolution of punctuation reflects a shift from physical pauses to grammatical structure. In early writing systems like Mayan or Chinese, symbols were often self-contained (logographic), making spacing or punctuation unnecessary because each character carried its own meaning. As writing evolved, marks began to serve as aids for both silent reading and oral performance, mirroring the natural rhythm of speech. Derived from the Latin 'punctus' (point), these marks eventually transitioned between the 15th and 17th centuries from simple indicators of pauses into sophisticated tools for clarifying complex grammatical construction.
One of the most recognizable modern symbols, the octothorpe (#), has a lineage rooted in Roman commerce. It originated around the 14th century as an abbreviation for 'lb,' standing for the Latin term 'libra pondo' (pound weight). Scribes would often add a horizontal bar—a tittle or tilde—to this abbreviation. Over time, the rushed handwriting of scribes caused these barred 'lb' marks to mutate into the abstract '#' we see today. Even its common name, 'pound sign,' is a direct linguistic descendant of the original Roman term 'pondo.'
Other early marks were even more rudimentary. In ancient Greece, writers used the 'paragraphos'—a simple horizontal stroke in the margin—to signal conceptual shifts in unbroken blocks of text. This was the ancestor of the pilcrow (¶). Unlike modern punctuation, which provides specific rules for grammar, these early marks were crude instruments; it was up to the reader to guess whether a mark signaled a new topic, a change in stanza, or a shift in thought.
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Sources
- Summary by Intellect · source: When Did People Start Using Punctuation?
- Also: Punctuation | Definition, History, & Facts | Britannica
- Also: The Ancient Roots of Punctuation | The New Yorker
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