Tritare

A tritare is an experimental guitar invented in 2003 by mathematicians Samuel Gaudet and Claude Gauthier of the Université de Moncton of a family of stringed instruments which use Y-shaped strings, instead of the usual linear strings.

Instrument sound and reactions

Y-shaped strings can produce sounds which are harmonic integer multiples, but also non-harmonic sounds more akin to those produced by percussion instruments.
The model uses 6 strings and was commercially available for a short period. The sound effects achieved with the instrument are similar to the sounds that can be achieved with the 3rd bridge playing technique. When tuned correctly, the Y-shaped strings create Chladni patterns.
Depending on how each note is played, Gaudet explains that non-harmonic ingredients can be included and offer a richer sound than a classical stringed instrument.