Hi Anton,
> I'm looking at groff_char(7) and see
>
> N/A \[-+] uni2213 u2213
>
> or when I try using it:
>
> full.1:5686: warning: can't find special character `-+'
>
> How can I access the "minus plus" symbol?
Tell us a little more about how you are trying. It works here for some
of my tests.
$ echo '\[-+]' | nroff | grep .
∓
$ echo '\[-+]' | nroff -Tascii | grep .
-+
$ echo '\[-+]' | nroff -Tiso-8859-1 | grep .
∓
$
I'm guessing it's to do with the type of output you're producing.
Cheers, Ralph.