Starting a new space gives you the option for giving it a name
Giving your space a name
The name of your space is the name you will later share with others.
How is my space shared with others?
How will my space name look as an URL?
Special letters are not allowed in the name, such as ( #, ! or : ).
The only exception is dash ( - ).
Which is natural, have you ever seen a webpage with a hashtag ( # ) in its URL?
The name cannot be changed without deleting the space