Dulcimer

Dulcimer is the name given to two types of stringed musical instrument:

The Appalachian dulcimer, a fretted, plucked instrument which is also referred to as a mountain dulcimer or just a dulcimer, and
The Hammered dulcimer, which is a hammer-struck, trapezoid-shaped zither

The instruments are quite different, but are both members of the zither family of instruments.