It's glyph 2213 in Arial Unicode MS (in the Mathematical Operators subset).
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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site:
http://www.mvps.org/word
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Martin,
I don't know if there is a special symbol. You can create
a fair representation with an EQ field.
{EQ \o(+,-)}. The minus sign is an em dash CTRL+(Number
pad hyphen). You will need to use Format>Font>Character
Spacing>Position>Raised to bring the em dash up about 4
pts. You can play around with this and maybe get
something that will work for you. If used often, you can
select, press ALT+F3 and create a AutoText entry for the
symbol.
The Field code brackets { } are entered using CTRL+F9
HTH