Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria
is a spine like feature of the test, formed by the fusion of inner siliceous bars and beams
A predominantly vertical structure extending from the solar chromosphere into the corona, observed in Hydrogen-Alpha Spicules are concentrated on the boundaries of super-granulation cells, have lifetimes of 5 to 10 minutes, and are about 1000 km across and 10,000 km long