Which instrument has the least strings?

The instrument with the least strings is typically the unstrung or percussion instruments, like a tambourine or a drum, which do not have any strings at all. However, among stringed instruments, the one with the least number of strings is often the one-stringed instrument, such as the diddley bow or certain types of traditional instruments. These instruments use a single string to produce sound, highlighting the variety and creativity in string instrument design.