What is "mandobass"

Mandobass is the largest (and least common) member of the mandolin family, sometimes used as the bass instrument in mandolin orchestras. It is so large that it usually isn't held in the lap, but supported on a spike which rests on the floor. The neck-scale length on a full-size mando-bass is similar to that of a standard orchestral double bass viol: about 43" (110 cm). The instrument is otherwise similar to the smaller, higher-pitched members of the mandolin family, having a fretted neck, a headstock with geared tuning machines, and a large resonating body often—but not always—shaped like that of other mandolins.