The at sign, @, normally read aloud as " at ", also commonly called the at symbol or commercial at, was originally an accounting and commercial invoice. IN ISRAEL the @ symbol is often referred to as "strudel". Computer books often refer to @ as the " at sign". Anyone who ever made or cut a strudel would agree. The @ (arroba) symbol has been part of the Spanish language since at least the days of Columbus. When Spanish speakers began using email, it became a natural step to simply use the term arroba , thus putting a word from the days of Columbus into the lexicon of the computer age. Computer architecture provides an introduction to system design basics for most computer science students. Other linguists will argue that the sign is a more recent development, appearing sometime in the 18th century as a symbol used in commerce to indicate price per unit, as in 2 chickens 10 pence. Das Zeichen , gesprochen "ett", das auch als Commercial "a" bezeichnet wird, wird vorwiegend als Platzhalter und Steuerzeichen verwendet. For the letter A within a circle, see Enclosed A. Die Zeit des Lichts galt als eine kommende Phase der Aufklärung und der entfalteten Persönlichkeit eines einzelnen Menschen. There are also great potentials within the area of Online Stock trading -- with the established standard of listing stocks and retrieving Market information by ticker symbol. Onti Chowdary, Bangladesh Just spoke to someone on the phone in Bosnia. So a receipt could say something like " 5 botellas 15 pesos " to indicate that five bottles were sold at 15 pesos each. In Haskell ist das gelesen as , engl. It came to Spanish, like most Spanish vocabulary, from Latin, where it probably was used by scribes as a quick-to-write combination of the a and the d for the common preposition ad , whose meanings included "toward," "to" and "on. Übliche Bezeichnung für die Varianz einer Zufallsvariable. In contemporary English usage, is a commercial symbol, called at site or at rate meaning at and at the rate of.