Breen language
From Memory Alpha, the free Star Trek reference.
The Breen language is the language spoken by the Breen. To Human ears, it sounds like garbled electronic sounds. Universal translators have to be adjusted in order to properly translate the syntax. (DS9: "Strange Bedfellows")
Michael Eddington once sent a Breen nursery rhymefile info that was intercepted by Benjamin Sisko aboard the Defiant. It was a heterophonic, five line song with an alternating tetrameter and pentameter structure, but other than the catchy tune, it did not mean anything. (DS9: "For the Uniform")
