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Most form fields are set up to use a single font, so you're limited to the characters that are available in the font, unless scripting is used to further restrict what can be entered. You can use the character map utility (on Windows) to see what characters are available, assuming you know which font is used for the field. You can copy the character you want with the utility or deterine the numeric code of the character to enter via the keyboard.
Though obviously unlikely in this case, a field can be set up to allow rich text formatting. This allows the user to set the font that's used for certain characters, as well as other attributes. So a user would be able to use a symbol font or a symbol from some font other than the default one.
Thanks, George. I admit I hadn't realised - or maybe I just forgot - that Character Map was available in Windows System Tools & not just in MS Word! Thanks again.
Another method (on Windows) is using Alt Codes - search Google for alt codes.
Example: hold down the Alt key while you type 0235 on the numeric keypad; it will result in the character ë.