The ± symbol is used for number ranges. For example 17 plus or minus 2  
ie 15 to 19 would be 17 ± 2.

David

> Can anyone tell me what is the name for § ?
> Has anyone found a use for ±?
> I found some thoughts here:
> http://discussions.apple.com/thread.jspa?threadID=838938
>
>
> >


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