There is a three-stringed ukulele, which is very rare. What's its name? A new musical instrument

The shape of the instrument in the picture is very similar to that of a guitar (several strings can't be seen clearly) An instrument similar to this one should be called "ukulele", but it should be four strings instead of three strings.

? Ukulele literally means "jumping flea". It is a four-string, high-pitched and guitar-shaped instrument. Ukulele is a unique musical instrument in Hawaii, which was transformed from a small four-string guitar brought to the islands by Portuguese migrant workers in the19th century. It is said that ukulele is the ancestor of keyboard instrument, and the appearance and use of keyboard is closely related to Creary, which is said to be the first stringed instrument in history. Its sound principle is very similar to that of a violin.