How to draw multiplication sign using Syncfusion PDF in mac or iphone

//Here I Draw Table and Add table in paragraph and also Define Font for text.
                IWParagraph paragraph = ChildTable[j, k].AddParagraph();
                paragraph.ParagraphFormat.HorizontalAlignment = HorizontalAlignment.Right;
                WTextRange txtfont = paragraph.AppendText(ChildList[k].Questions) as WTextRange;
                txtfont.CharacterFormat.FontSize = 18f;
                if (Device.RuntimePlatform == Device.Android)
                 {
                    txtfont.CharacterFormat.FontName = PdfFontFamily.Helvetica.ToString();
                 }
                 else  
                 {

                   txtfont.CharacterFormat.FontName = PdfFontFamily.Helvetica.ToString();
                 }