With this option you can insert the symbol into the document. And you can also define its shortcut key. It contains such words or signs. Which cannot be typed with the help of a computer keyboard. You can easily prepare your document by adding it to your document as needed.
This is a special type of option. With the help of which you can write the text of different types of fields in a document like maths formula, equation etc.
With this option, you can post comments in a particular word of the document.