Friction idiophones is one of the categories of musical instruments found in the Hornbostel-Sachs

Hornbostel-Sachs

Hornbostel–Sachs is a system of musical instrument classification devised by Erich Moritz von Hornbostel and Curt Sachs, and first published in the Zeitschrift für Ethnologie in 1914. An English translation was published in the Galpin Society Journal in 1961...

 system of musical instrument classification. These idiophones produce sound by being rubbed either against each other or by means of a non-sounding object. Instruments of this type are not very common, possibly the best known examples are the musical saw

Musical saw

A musical saw, also called a singing saw, is the application of a hand saw as a musical instrument. The sound creates an ethereal tone, very similar to the theremin...

, and the nail violin

Nail violin

The nail violin is a musical instrument which was invented by German violinist Johann Wilde in 1740. Wilde was inspired to create the instrument when he accidentally drew his bow across a metal peg, which produced a musical sound...

.

Friction sticks (131)

131.1 Individual friction sticks.

131.2 Sets of friction sticks.

• Nail violin
  Nail violin
  The nail violin is a musical instrument which was invented by German violinist Johann Wilde in 1740. Wilde was inspired to create the instrument when he accidentally drew his bow across a metal peg, which produced a musical sound...
  
  

131.21 Without direct friction.

131.22 With direct friction.

Friction plaques (132)

132.1 Individual friction plaques.

• Daxophone
  Daxophone
  The daxophone, invented by Hans Reichel, is an experimental musical instrument of the friction idiophones category. It consists of a thin wooden blade fixed in a wooden block , which holds one or more contact microphones...
  
  
• Musical saw
  Musical saw
  A musical saw, also called a singing saw, is the application of a hand saw as a musical instrument. The sound creates an ethereal tone, very similar to the theremin...
  
  

132.2 Sets of friction plaques.

Friction vessels (133)

133.1 Individual friction vessels.

133.2 Sets of friction vessels.

• Glass harmonica
  Glass harmonica
  The glass harmonica, also known as the glass armonica, bowl organ, hydrocrystalophone, or simply the armonica , is a type of musical instrument that uses a series of glass bowls or goblets graduated in size to produce musical tones by means of friction The glass harmonica, also known as the glass...
  
  
• Glass harp
  Glass harp
  A glass harp is an instrument made of upright wine glasses....
  
  
• Verrophone
  Verrophone
  A verrophone is a musical instrument, invented in 1983, by Reckert, in which open-ended glass tubes are arranged in various sizes . The sound is made by rubbing one end of one or more of the glass tubes, or also by striking them or rubbing them with a special mallet...