Dulcimer
A dulcimer is a type of musical string instrument. It is a variety of zither. Among its forms are:
 Hammered dulcimer, free-standing, frequently trapezoidal in shape, with many strings struck by handheld "hammers". This type of instrument is found in many cultures, which have their own name for the instrument. 
 Fretted, three or four strings, generally played on the lap by strumming; including
 Appalachian dulcimer, a folk instrument used in the Appalachian region of the U.S.
 Banjo dulcimer, with banjo-like resonating membrane
 Resonator dulcimer, with inset conical resonator
 Other
 Bowed dulcimer, teardrop-shaped and played upright with a bow
 Electric dulcimer, various types of dulcimer which use a pickup to amplify the sound