Whistled Turkish
Quite a similar thing exists on the Canary Islands in Spain, where I grew up [1]. It was even taught in school, though I joined in too late and never managed to get the basic whistling parts, which made the rest quite impossible to learn :/<p>[1]: <a href="https://en.m.wikipedia.org/wiki/Silbo_Gomero" rel="nofollow">https://en.m.wikipedia.org/wiki/Silbo_Gomero</a>