Are there any stringed instruments with only one string?

The most well-known stringed instrument with only one string is the monochord. The monochord is an ancient instrument that dates back to the 6th century BC and is still used today in various forms. It consists of a single string stretched over a soundboard and is typically played by plucking the string with a finger or a plectrum. The sound produced by the monochord is pure and clear, and it can be used to produce a variety of musical tones.

Another instrument that has only one string is the diddley bow, which is a traditional African instrument. The diddley bow is made from a wooden stick with a single string attached to it, and it is played by holding the stick in one hand and plucking the string with the other hand. The sound produced by the diddley bow is often used to accompany singing and dancing.