To type in symbols like a square bracket, you'll need to use one of the navigation buttons to access a secondary keyboard.

Accents are assigned to particular letters on your keyboard, but you can find the associated accents and keys here. iOS Adding some accents to your missives in iOS is simple.

To type special characters in Windows, hold the Alt key, type the number code associated with the special character you want using the numpad that's located on the right side of your keyboard.