Any sign for that?

I'd guess that you can use musical notation for the pitch.

There is a famous language called Silbo Gomero (link) used by folks on the Canary Islands. In the first article click on the link for whistled languages to see a short paragraph on the physics of whistles. There seems to be some minor amount of vocalization going on by changing the vocal tract. A whistle is similar in the manner of articulation to a fricative, with the place of articulation at the lips, though a little bit different from /ɸ/ and /β/. I've seen whistlers who also use their cupped hands in front of their mouths to change some aspect of the whistle. There's also a PhD dissertation (in French) on whistled languages from a linguistic and bio-acoustic POV, link.

There was also a musical artificial language called Solresol (link).

Ceci n'est pas un seing.