1896) appears to refer to the symbol as the "number mark". The instruction manual of the Blickensderfer model 5 typewriter ( c. The symbol is described as the "number" character in an 1853 treatise on bookkeeping, and its double meaning is described in a bookkeeping text from 1880. Ultimately, the symbol was reduced for clarity as an overlay of two horizontal strokes "=" across two slash-like strokes "//". This abbreviation was printed with a dedicated ligature type element, with a horizontal line across, so that the lowercase letter l would not be mistaken for the numeral 1. It is believed that the symbol traces its origins to the symbol ℔, an abbreviation of the Roman term libra pondo, which translates as "pound weight". History A stylized version of the abbreviation for libra pondo ("pound weight") The abbreviation written by Isaac Newton, showing the evolution from "℔" toward "#" The symbol is distinguished from similar symbols by its combination of level horizontal strokes and right-tilting vertical strokes. Since 2007, widespread usage of the symbol to introduce metadata tags on social media platforms has led to such tags being known as " hashtags", and from that, the symbol itself is sometimes called a hashtag. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔. The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign.
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