How to name versions
There are no absolute rules to naming versions, but there are best practices.
The version names you choose should be a simple name (such as
          "v1") that provides a sequence. The sequence approach allows you to
        organize your versions in a logical manner that makes sense to you. 
The version need not be numeric, nor be specified using
        the “v[x]” syntax. Alternatives that you find meaningful
        can be used, such as dates or project names. The only criteria is that they be flexible to
        change as the versions change.