BaseFont bfSpecial = BaseFont.createFont("get_font/verdana.ttf",BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font my_font = new Font(bfSpecial, 9, Font.BOLD, BaseColor.BLACK);
document.add(new Paragraph("\n",my_font));
document.add(new Paragraph("*(₺₺₺₺₺)*",my_font));
document.add(new Paragraph("\n",my_font));
How to View the ₺ (Turkish Lira) sign on PDF?
I finally solved the problem. I just had to use the font "DejaVuSerif.ttf" for the solution. you can download the font here
BaseFont bfSpecial = BaseFont.createFont("get_font/DejaVuSerif.ttf",BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font font = new Font(bfSpecial, 9, Font.NORMAL, BaseColor.BLACK);