Throwing stars have multiple points with sharpened tips to allow them to stick into a target regardless of how it hits. Usually having between 4 and 6 points, there is always a blade that is facing forward when it impacts. There is even an eight-point star below that increase your chances of a "stick".
Getting good at hitting where you want them to and making them stick is a fun activity to do whether by yourself or with friends. After a bit of practice, you'll be hitting and making them stick on every throw. You can create your own mark to toss them at or you can order yourself a ninja target board and be ready to go.