The mandocello is a plucked string instrument of the mandolin family. It is larger than the mandolin, and is the baritone instrument of the mandolin family. Its eight strings are in four paired courses, with the strings in each course tuned in unison. Overall tuning of the courses is in fifths like a mandolin, but beginning on bass C (C2). It can be described as being to the mandolin what the cello is to the violin.
Redhead brand mandocello
The Mandolin "Estudiantina" of Mayenne, France around 1900 when Mandolin orchestras were at the height of their popularity
Gibson mandolin family: mandocello is 2nd from right, front row
Plucked string instrument
Plucked string instruments are a subcategory of string instruments that are played by plucking the strings. Plucking is a way of pulling and releasing the string in such a way as to give it an impulse that causes the string to vibrate. Plucking can be done with either a finger or a plectrum.
Guitar and lute
This illustration in a French Psalter from the 9th century (c. 830) shows an unspecified plucked string instrument.
Stringed instruments hanging on a wall. Shown here are 4 Ukuleles, 2 Mandolins, a Banjo, a Guitar, a Violin, a Guraitar and a Bass guitar.
Qanún/kanun, origin from ancient Mesopotamia