The answer is that you type 2 characters to make a heart, which are the less than symbol < and 3, when together make a heart <3 And that’s only 2 characters, which is less than 3. So the answer is both the instructions on how to type a heart and the number of characters required to type a heart.
Love my kobo e-reader, and in the UK at least you can connect it to your local library using something called OverDrive and rent ebooks for free