@ ⇒ The '@' sign originated
as a scribe's quick way of writing the Latin word ad, especially in lists
of prices of commodities.
It's usually just known as 'the at sign'
or 'the at symbol': although it has acquired
various nicknames in other languages, none of these has so far caught on in
English.
# ⇒ The '#' sign
has several names. The most common is probably hash.
- In North American English, it's sometimes called the pound sign and used as a symbol for pounds weight: this can be confusing for British people for whom a pound sign is £.
- It's also known as the number sign in North American English, in contexts such as go to question #2. In a musical context, the symbol is known as a sharp.
- The picturesque name octothorpe has also been introduced: it's said to have been invented by an employee of Bell Laboratories in the 1960s, in honour of the American athlete Jim Thorpe (with the octo-part deriving from the symbol's eight points).
- In the large form in which it appears on telephones it's sometimes called a square.
- Recently, the hash sign has acquired a new role. On social networking sites such as Twitter, it's attached to keywords or phrases so as to identify messages on a particular topic (e.g. #volcano; #Iceland). These keywords or phrases are known as hashtags.
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