A simple whistle.  Perhaps not.  I thought I knew.  How it works is one thing, but I was surprised to know just well what more I did not know.   I gave myself 20 mins to go find out more about the subject.  Now I'm sharing with you what I found out.  Yes, you are allowed to subscribe.  Please feel free to share this on Social media and let me know if there is a subject you would like covered.

https://en.wikipedia.org/wiki/Whistled_language

https://en.wikipedia.org/wiki/Whistle

Music: Cheeky by Shane Ivers - https://www.silvermansound.com