Ka'athyra
The ka'athyra was a Vulcan musical instrument. According to Altan Inigo Soong, Sutra played the ka'athyra. ()

Apocrypha
The term "ka'athyra" was first given in the 1985 non-canonical novel Dwellers in the Crucible for the Vulcan lute in the Vulcan language.

Vulcan language
Musical instruments