When talking about temperature, I don't see anyone using the degree
mark, ° , so, for anyone who wishes to use it, here is how it is done; On a
PC, hold down the 'Alt' key and type the numerical digits 0176 from the
number pad to the right of your keyboard (there's a different procedure on a
Mac®). This gives a ° in plain text, the script we use for NAFEX. If you
were to type Alt 0186, you'd get a ° in rich text but if you sent that to
the list-serv, it would print a ? instead. If anyone is interested in other
special characters, do let me know.