Letters, numbers, and special characters can be used. On word 2007 to 2013 on windows, you can use ctrl + alt + v. This questions is related, but different than.
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It can be any name you like, so long as it is followed by a period and then the value in curly braces. There's nothing special about the string godmode; On word 2011 for mac, you can use control + command + v.
In windows, there is the possibility to type special signs from the keyboard by holding the alt key and typing a few numbers, that depends on.
