Loop tools. The photo shows four. The first is also known as a coiler.This name is used because the metal is round and it is used for coiling. There are many different ones with wooden or plastic handles, thin metal wire loops at one or both ends, loops of different shapes and the metal can be flat or round. They are used for slicing off strips of clay to make a shape or pattern. The drawing shows a jar being fluted.
Scooper is also a loop. There are large ones for getting clay out of containers and small sizes which are very easy to make. This is explained under making a scooper.
Read more about: Coiler / Coiling – Coil Building / Coiling – With a slab roller