The estampie and saltarello are no kind of instruments at all. They are types of music common in the Medieval era. Both are believed to be dances.

The saltarello was a dance, with leaping steps in a fast triple time. The steps are unknown, and although pictures and music exist, they are not enough to reconstruct the step.

There is a link to an article below.

It's a name of something but i do not know and i am trying to figure it out too.

The word ballet appeared to originate in 1416 Domenico di Piacenza wrote "On the Art of Dancing and Conducting Dances" (De Arte Saltandi ed Choreas Ducendi) Domenico di Piacenza described the components of various dances and divided them into 12 movements ie. nine natural and three artificial. He named four types of danse in accelerating tempi These were the stately Basse danse; the Quadrilena; the Saltarello; and the vigorous bagpipe dance called the Piva. The Basse danse was the basis for many variations known as Balli. His use of the Italian word 'ballo' instead of 'danza', to describe the choreography meant his dances subsequently became known as baletti or balli, (singular: balletto).