IsNumeric Does not Work!

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Hi,
When I was looking my codes and I Found something causes some errors.
some dimesions if it contains some value like that

Dim MyDimension
MyDimension="2800+"
Msgbox Isnumeric(MyDimension)
MyDimension="2800-"
Msgbox Isnumeric(MyDimension)

Msgbox Says that all of them are True , these situations indicate that These
Values are Numeric

I cannot Understand This value how can it be Numeric.
İf I need a numeric value , If I test with Isnumeric it causes problem for me.

Do you know Why It is numeric?

Thanks A lot
.

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