Most people use this trick to to prevent robots from scraping their email address, yourname[at]yourdomain[dot]com on the web.
They just replace the ‘@’ with [at] and the ‘.’ with [dot].
That technique is very common. But if you want to make a little bit different, you may use something like this,
or custom domain like this,
Want to know how? Just go to Nexodyne website and create your email icon for free.