Alias are used throughout the system when setting up Users,Teams, Departments and Sites. 

It is the tag that you give to a User, Team, Department or Site so that you are able to direct communication to them in the future easily. 

An Alias can be set to whatever you desire but we recommend that it is logical to make it easy for the user to find. 

It mustn't include spaces but symbols can be used to make it easier to read for example the Leicester office may have an alias of @leicester_office. The Customer Success Team may have an alias of @cust_success

Later when sending an alert or perhaps an article you can then start typing an alias to direct to that person or group of people.

Or perhaps to mention someone or a group of people.