Throwing Stars are primarily oriental weapons.
They originated in China. The art of Ninjitsu or Throwing Star or
Shuriken was mastered by the Japanese. The Shuriken has striking
surfaces on all edges. They have the most artist yet the most lethal
look.

These
are very precise weapons that have to be balanced for perfect aiming. .
Throwing stars usually come with 3 points and up to 8 points that are
very sharp and made of stainless steel or other hard metals. The
Shuriken or the Ninjitsu Star is a throwing weapon designed to lethally
injure or kill the target. It can be easily hidden.
They are the Ninja protection tools that are still used by the army men
as a stealth weapon. More commonly it is made as a collectors item. They
form an integral part of many of the martial arts including Kung Fu.
They are given different names as per the pattern and the number of
pointed edges.
The replicas though are not very sharp they are still in demand by the
collectors. Manufacturers replicate the authentic ninja throwing stars
specifically for the collectors and museums.