That little "a" with a circle curling around it that is found in email addresses is most commonly referred to as the "at" symbol.
　　小写字母a外加个圆圈，这一符号常出现在email（电子邮件）地址中，通常是作为"at"(在)的标记。

　　Surprisingly though, there is no official, universal name for this sign. There are dozens of strange terms to describe the @ symbol.
　　然而令人感到惊奇的是，这一标记居然没有官方的，通用的名称。有几十个奇怪的术语用来描绘@这一符号。

　　Before it became the standard symbol for electronic mail, the @ symbol was used to represent the cost or weight of something. For instance, if you purchased 6 apples, you might write it as 6 apples @ $1.10 each.
　　@这一符号在成为电子邮件的标准符号之前，曾被用来表示物品的单价或质量。例如，你买6只苹果。就可以写成"六只苹果，每只@$1.10，表示每只苹果1.10美元。

　　With the introduction of e-mail came the popularity of the @ symbol. The @ symbol or the "at sign" separates a person's online user name from his mail server address. For instance, joe@uselessknowledg

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