CATPLE

1. stake: an elongated wood or metal pole embedded in the bottom to serve as a marker or support. (adapted from IHO Dictionary, S-32, 5th Edition, 4960)
2. post: a vertical piece of timber, metal or concrete forced into the earth or sea bed.
3. tripodal: a single structure comprising 3 or more piles held together (sections of heavy timber, steel or concrete), and forced into the earth or sea bed. (adapted from IHO Dictionary, S-32, 5th Edition, 3840)