High Quality Content by WIKIPEDIA articles! The at sign (@), also called the ampersat, apetail, arroba, atmark, at symbol, commercial at or monkey tail, is formally an abbreviation of the accounting and commercial invoice term "at the rate of" (e.g., 7 widgets @ $2 = $14). In recent years its meaning has changed to also mean "at" in the sense of "located at", especially in email addresses. Increasingly, @ has also been used as a prefix to user names (e.g., @username) on social websites, either simply as a textual addition to direct their attention or denote an attribution/link, as on forums and suchlike; or used so that the site's parser will detect and notify the person using that user name of the reference, as on Twitter and Facebook (although the latter's parsing now automatically detects user names without the symbol). Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в информационном сетевом ресурсе "Википедия" в...

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