Arrowheads are attached to arrow shafts and may be fired from a bow , similar types of projectile points may be attached to spears and `` thrown '' by means an Atlatl -LRB- spear thrower -RRB- .

Arrowheads are attached to arrow shafts and may be `` thrown '' -LRB- similar to a spear thrower -RRB- , or fired from a bow .
