A caret annotation: a symbol marking where text is to be inserted.
public sealed class PdfCaretAnnotation : PdfMarkupAnnotation
ISO 32000-2 §12.5.6.11, Table 183 (PDF 1.5).
kind:method, kind:property, kind:ctor. Press Esc to clear.RectangleDifferencesGets the differences between the annotation rectangle and the drawn rectangle (RD, PDF 1.5), or null.SymbolGets the symbol associated with the caret (Sy); default none.