Registration numbers must be not less than three inches (3) in height and the. documented name must be in 4-inch letters. Spaces or hyphens should be equal to the. width of a letter other than I or a number other than 1. On vessels so configured that a.
Sponge Animation: Spicules. Spicules are microscopic structures of hard crystal material with fantastic shapes unique to the different species of sponge. They are part of the skeleton that helps give the sponge its shape.
A bone spicule could derive different meanings in different medical fields. This term is being used in dentistry, osteology and ophthalmology. In dentistry, it is characterized by bony fragments or protrusions either loose or still attaching to jaw bone after a tooth extraction.