Billie Eilish works with the guitar brand Fender to sell her self-designed ukulele. That’s a kind of small guitar with only four strings. On the instrument is the blohsh symbol that Billie came up with.
The ukulele is the first instrument Billie learned to play. She was only 6 years old at the time. She now sometimes performs with songs where she uses her ukulele. The instrument can be heard in the songs Party Favor and 8.
If you want such a ukulele you probably have to save some money. It costs almost 300 euros.