spiculum

spiculum A thrusting javelin used by Romans that replaced the pilum in the late 3rd century.
A sharp, pointed crystal, especially of ice.
puhekieltä A sharp, needle-like structure, especially those making up the skeleton of a sponge.
puhekieltä A small radial emission of gas seen in the chromosphere and corona of the sun.
little sharp point or sting
dart, arrow