You could use something like this to get rid of all the 'SketchedSymbols' named "Revision Mark" from your active sheet.
Dim oDDoc As DrawingDocument = ThisDrawing.Document
Dim oSheet As Inventor.Sheet = oDDoc.ActiveSheet
For Each oSS As SketchedSymbol In oSheet.SketchedSymbols
If oSS.Name = "Revision Mark" Then
oSS.Delete
End If
Next
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Wesley Crihfield

(Not an Autodesk Employee)