# The hidden logic behind #, @, & and §

Source: https://www.youtube.com/watch?v=cSsyG2pE-GY
Recap page: https://rapidrecap.app/video/cSsyG2pE-GY
Generated: 2026-06-15T05:55:43.278+00:00

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## Quick Overview

The symbols #, @, &, and § originated as practical abbreviations for Latin words, evolving through centuries of scribal practice and technological necessity. The '#' symbol represents an abbreviation for the Latin 'libra pondo' (pound of weight), the '@' symbol likely originated as a shorthand for the Latin 'ad' (at), the '&' symbol is a stylized form of 'et' (and), and the '§' symbol derives from the Latin 'signum sectionis' (section sign).

**Key Points:**
- The '#' symbol represents the Latin phrase 'libra pondo', meaning a pound of weight, later becoming a general number sign on keyboards.
- The '@' symbol functions as a shorthand for 'at', originating from merchants using it to denote unit pricing in Latin-based languages.
- The '&' symbol, or ampersand, is a direct ligature of the Latin word 'et', which means 'and'.
- The '§' symbol stands for 'signum sectionis' and was created by combining two 'S' characters to denote legal or book sections.
- The asterisk '*' symbol translates from Greek as 'little star' and historically served as a critical mark for footnotes.
- The pilcrow '¶' symbol evolved from a 'C' used in medieval manuscripts to mark new chapters or paragraphs.

![Screenshot at 02:49: The final evolution of the '#' symbol from a scribal abbreviation of 'libra' into the modern hash sign.](https://ss.rapidrecap.app/screens/cSsyG2pE-GY/00-02-49.jpg)

**Context:** The video explores the etymological and historical evolution of common keyboard symbols. These characters, which are now ubiquitous in digital communication, were once handwritten shortcuts used by scribes and merchants to simplify the writing of Latin terms and organize complex texts.

## Detailed Analysis

These keyboard symbols are not merely decorative but are remnants of historical abbreviations used to save time and parchment. The '#' (pound/hash) originated from the Latin 'libra', abbreviated as 'lb', which scribes eventually combined with a horizontal line to indicate an abbreviation, leading to its modern form. The '@' symbol, while often associated with email, appeared in 1345 as a shorthand for 'at' and was later used by merchants for pricing. The '&' (ampersand) is a stylized 'et', a Latin word for 'and', often taught as the final letter of the alphabet in the 19th century. The '§' (section sign) consists of two 'S's for 'signum sectionis', while the pilcrow '¶' evolved from a 'C' for 'capitulum' (chapter). These symbols demonstrate how technological constraints, from medieval quill-on-parchment to digital teletype, have continuously shaped our written language.

### Pound and Hash

- Latin 'libra pondo' abbreviated to 'lb'
- scribes added a horizontal line to indicate abbreviation
- the symbol moved to telephone keypads and social media

### The Ampersand

- Latin word 'et' means 'and'
- the word 'ampersand' comes from reciting 'and per se and'
- modern fonts still reflect the ligature of E and T

### The At Symbol

- earliest appearance in 1345 as a shorthand for 'at'
- used by merchants to denote unit pricing
- Ray Tomlinson chose it for email because it was rarely used

### Legal and Book Markers

- section sign § combines two 'S's for 'signum sectionis'
- pilcrow ¶ evolved from a 'C' for 'capitulum'
- these symbols marked transitions in text

### Footnote Markers

- asterisk * translates to 'little star'
- asterisk historically marked text the reader doubted
- asterisk and dagger symbols serve as a hierarchy for footnotes

![Screenshot at 01:56: A 1700s text showing 'lb' with a line through it as a symbol for 'pound weight'](https://ss.rapidrecap.app/screens/cSsyG2pE-GY/00-01-56.jpg)
![Screenshot at 11:51: A 1536 merchant letter highlighting the earliest known use of the '@' symbol](https://ss.rapidrecap.app/screens/cSsyG2pE-GY/00-11-51.jpg)
![Screenshot at 15:48: Medieval manuscript showing red and blue 'C' symbols marking new sections of text](https://ss.rapidrecap.app/screens/cSsyG2pE-GY/00-15-48.jpg)
![Screenshot at 19:26: A standard hierarchy of footnote symbols including the asterisk, dagger, and pilcrow](https://ss.rapidrecap.app/screens/cSsyG2pE-GY/00-19-26.jpg)