There are certain relatively obscure instruments that have 17 strings - but none are ones that I can play. In my case, I chose the screen name for plural favorite instruments, with strings adding up to 17, that I can and do play. ;)
Aha, I see. I play 12 string and 6 string guitars, and have dabbled in a dulcimer but need to get new strings for it. That would total 22 strings!