Sea anchor
Modern commercial sea anchors are usually made of cloth, shaped like a parachute or cone, and rigged so that the wider end leads and the narrower end trails. When deployed, this type of sea anchor floats just under the surface, and the water moving past the sea anchor keeps it filled. Some varieties are cylindrical, with an adjustable opening in the rear that allows the amount of braking to be adjusted when deployed.
Anchor (climbing)
A load-sharing (or load-distributing) anchor is a system consisting of two or more individual anchors which join together at a main anchor point to form an anchoring system. This configuration is a way to introduce redundancy and increase strength, typically for a belay anchor. If assembled correctly, the load will be distributed to each individual anchor, rather than placing all the load on a single anchor point. This decreases the chance that any single anchor point will fail, and, if a point does fail, the other(s) should still be able to hold.