@validated用法

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en.wikipedia.org

At sign - Wikipedia

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), [1] and now seen more widely in email addresses and social media ...

howtosensei.com

How to Type @ Symbol: Guide for Every Keyboard Layout

Sep 11, 2025 · To type @: Shift + 2. That’s it. The @ symbol is printed right on the 2 key. Hold Shift, press 2, get @. If this doesn’t work: This is what most online tutorials assume you have. If Shift+2 gives you so...

cpsymbol.com

At Symbols (@) Copy and Paste - cpsymbol.com

In 1971, Ray Tomlinson, a computer programmer, introduced the @ symbol in email addresses, making it a global digital standard. The @ symbol is now widely used in social media, email, and coding.