Similar to the Gmail Dot feature and the + feature there is one more feature in gmail, where the gmail = googlemail

The Googlemail Feature

Here is equal to

Which means [email protected] = [email protected]

About this google says

Also, if you’re receiving messages sent to your username, don’t be concerned. [email protected] is the same as [email protected], too; is Google’s email domain for users in the United Kingdom and Germany, so if you register your username, it becomes unavailable in as well.

There are multiple uses of this feature some of which I have listed here.