A rubber stamp annotation: text or graphics that look as if stamped on the page.
public sealed class PdfStampAnnotation : PdfMarkupAnnotation
ISO 32000-2 §12.5.6.12, Table 184 (PDF 1.3).
kind:method, kind:property, kind:ctor. Press Esc to clear.IconNameGets the name of the stamp's icon (Name), such as Approved or Draft (the default); null when the intent is present and not Stamp, such as StampImage or StampSnapshot, where a Name entry is ignored with a diagnostic.