For example, if you type “@Chi”, Google will pop up a series of contacts including this name, and the user can filter and insert it into the email. @User will automatically generate a link after clicking and will pop up a new window after clicking.
This feature is handy if you want to introduce someone to your friends, or quickly insert a user’s email address into the message. This feature is currently available in the new Gmail enabled.
Source, Image: TNW
