Any percussion that can't be tuned is non pitched. cowbells, triangle, tambourine
There is a percussion clef, which is two short vertical lines at the beginning of the staff.
Neutral Clef or "Percussion Clef"
A vibraphone is a pitched percussion instrument.
A pitched percussion instrument play numerous pitches (i.e. xylophone), while nonpitched percussion instruments play one pitch (i.e. snare drum).
A triangle is not necessarily pitched or non-pitched. It is more of an accessory.
Pitched and unpitched percussion.
Cabasa
Non-pitched percussion instruments are used for a few reasons, providing a beat and a cool backbone to the song. Pitched percussion instruments are usually used for harmony or the melody of a song, they don't have that backbeat that a snare or a bass has, and a snare and a bass don't have the melody to the song, such as a Marimba would.
Pitched and unpitched instruments.
Most percussion is non-pitched, meaning it doesn't play a specific note. So instead of using a treble or bass clef, the percussion clef is two vertical bars, running between the 2nd and 4th lines.
The two types of percussion instruments are pitched percussion and unpitched percussio n; pictch percussion produces a note and an audiable pitch, whereas unpitched percussion merely produces a note.
Some percussion instruments may, and some may not. Usually if something like a drum has tuning equipment, it may be tuned to whatever pitch you desire.