Whistling
Whistling was the ability to pass air through puckered lips, producing a flute-like sound. It could be done to produce music or attract someone's attention.

In 2255 of the alternate reality,  whistled sharply to break up an altercation between  and several Starfleet Academy cadets. Kirk then noted the  of Pike's whistle. ()

Cyrano Jones whistled as he entered the bar on Deep Space Station K-7, just before he offered Montgomery Scott, Pavel Chekov, Lieutenant Freeman, and Korax the chance to buy a tribble. ()
 
Upon Commander William T. Riker's first meeting with Data, he finished whistling a song that the android found difficult to replicate. () Later on, after Data's destruction, Riker could remember the incident, but not which song it had been. ()

In 2367, Doctor Noonian Soong asked Data to whistle for him. Data complied with an off-key rendition of the same tune. ()

Some kinds of teapots could also produce a whistling noise. While trying to convince The Doctor that he should not have his musical subroutines altered by her, B'Elanna Torres remarked that she could even change him into a whistling teapot if he wanted, but he wouldn't be himself anymore. ()

See also 
 Boatswain's whistle

External link 
 
Skills