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The at sign, @, is normally read aloud as "at"; it is also commonly called the at symbol or commercial at. It is used as an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 widgets @ ?2 = ?14), but it is now most commonly used in email addresses and social media platform "handles".
Although not included on the keyboard 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. It started to be used in email addresses in the 1970s, and is now universally included on computer keyboards.
The fact that there is no single word in English for the symbol has prompted some writers to use the French arobase or Spanish and Portuguese arroba, or to coin new words such as asperand, ampersat and strudel, but none of these has achieved wide use.