Powershell -DomainMode and -ForestMode

When you use PowerShell to install a new forest. The values for -DomainMode and -ForestMode are the following:

     -- Windows Server 2003: 2 or Win2003
     -- Windows Server 2008: 3 or Win2008
     -- Windows Server 2008 R2: 4 or Win2008R2
     -- Windows Server 2012: 5 or Win2012
     -- Windows Server 2012 R2: 6 or Win2012R2

You can use the numeric value or you can write it in text as shown above.