Normally, you cannot do this. But, if you name a global string "Global Value AA" it will let you. Then keep clicking the New button for global values until it make Global Vale AA (after Global Value Z) and no error message will occur. If you try to rename it, it comes up blank, and if you use it in an expression, you can't get the string and it will only let you get the number. Nobody would 'accidentally' do this, but surely this needs to be fixed. :p