In German orthography the umlaut version of a vowel is pronounced differently from the normal vowel; the letters u and ü represent distinct sounds, as do o and ö as well as a and ä. In the Latin languages it's used to show differences in usual pronounciation: e.g., Spanish bilingüe (bilingual) is pronounced [bi.liŋ.gue] instead of [bi.liŋ.ge]; Catalan països (countries) is pronounced [pə.i.zus] instead of [pəi.zus]; in this form of usage it's called a dieresis.
Among English speakers, the use of umlaut marks and other diacritics with a blackletter style typeface is a form of foreign branding intended to give a band's logo a Teutonic quality—connoting stereotypes of boldness and brutality presumably associated with Germanic and Nordic cultures. Its use has also been attributed to a desire for a "gothic horror" feel. The metal umlaut is not generally intended to affect the pronunciation of the band's name.
Speakers of languages which use an umlaut to designate a pronunciation change may understand the intended effect, but perceive the result differently. When Mötley Crüe visited Germany, singer Vince Neil said the band couldn't figure out why "the crowds were chanting, Mutley Cruh! Mutley Cruh!"
These decorative umlauts have been parodied in film and fiction; in the mockumentary film This Is Spın̈al Tap, fictional rocker David St. Hubbins (Michael McKean) says, "It's like a pair of eyes. You're looking at the umlaut, and it's looking at you." The heavy metal parody band Gwar parodied the use of metal umlauts by filling the song names on its first album with decorative diacritics.
Death In June – British dark folk/experimental band used umlauts and accented "e"s in their name and titles on the original releases of their albums The Wörld Thät Sümmer (1985) and Thé Wäll Öf Säcrificé (1989), spelling their name, Deäth In Jüne and Déäth In Jüné, respectively on each.
Rrröööaaarrr and Dimension Hatröss – albums by Canadian thrash metal band Voïvod. They also used it for their songs "Korgüll the Exterminator" and "Chaosmöngers", which appear on Rrröööaaarrr and Dimension Hatröss respectively.
Rusted Root – American jam band uses a three-dot umlaut over the "e" in its logo, as seen on its album covers.
^"The full Mötley". The Age. 2 December 2005. Retrieved 8 September 2016. In the world of heavy metal, the umlaut - otherwise known as röck dots ...
^Garofalo, Rebee (1997). Rockin' Out: Popular Music in the USA. Allyn & Bacon. p. 292. ISBN0-205-13703-2. "Some groups, for example Blue Öyster Cult and Motörhead, added gratuitous umlauts to their names to conjure up a more generic gothic horror, a practice that continued into the 1980s with Mötley Crüe and others."