N̈
Appearance
Jacaltec, a Mayan dialect, and Malagasy are the only languages to allow a pair of dots over the letter "n", which is presented in unicode as "n̈". "N̈", or "n̈" is a glyph that represents a letter from several minor extended Latin alphabets, the letter N with an umlaut.
Letter Ö
The letter "N̈" occurs in Jacaltec, a Mayan dialect, and Malagasy.
Typography
The "N̈" appears in very few languages, and is thus not represented on any computer keyboards in any languages. It is also not available as an HTML entity.
Usage
The letter is probably most commonly known for its use in the title of the fictional band Spinal Tap. It is used as a parody of the heavy metal umlaut used gratuitously by several actual bands.