Throwing knives and axes, shuriken, etc. Thowing weapons do one point of damage to armor and may be blocked by weapons without penalty. Monks using the ablity Greater Missile Block can block throwing weapons with their hands.
 Legal requirements for Throwing Weapons
A blow by any part of a throwing weapon, boulder or rock counts as a hit; so all parts of these weapons need to be strike-legal. The tips of all projectile weapons must not be able to fit through a 2.25 inch ring. Projectiles, with the exception of javelins, may not have solid cores. Materials you may use for projectile cores include foam, sweatshirt material, and other soft, non-granular and non-rigid materials. Pennies, batteries, sand, and the like may never be used as cores. Throwing weapons may not have any exposed tape, and must have a legal cover.