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At sign
The at sign (@) is a typographical symbol used as an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 widgets @ £2 per widget = £14), and now seen more widely in email addresses and social media platform handles. Most languages have their own name for the symbol. Although not included on the keyboard layout of the earliest commercially successful typewriters, it was on at least one 1889 model and the very successful Underwood models from the "Underwood No. 5" in 1900 onward.
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