IsError and "-"

Hello, I am not sure what the "-" means in the below?  I think it has something to do with negative numbers?  


=IF(ISERROR(('Financial Statements'!D55-'Financial Statements'!D54)/'Financial Statements'!D54),"-",('Financial Statements'!D55-'Financial Statements'!D54)/'Financial Statements'!D54)

thank you
pdvsaProject financeAsked:
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pdvsaProject financeAuthor Commented:
Many times the number in D54 is negative and I am not sure if the "-" is somehow taking this into account?  It could have nothign to do with negative numbers though.  


thank you
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FostWareCommented:
The "-" is the second parameter in the IF function. If the first query returns a Error or Divide By 0 error, it'll print a "-" instead of the error message.
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pdvsaProject financeAuthor Commented:
thank you...
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