N̈
Appearance
"N̈", or "n̈" (referred to as n-diaeresis) is a glyph that represents a grapheme from several minor extended Latin alphabets, the letter N with an umlaut.
Letter N̈
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 Spın̈al Tap. It is used as a parody of the heavy metal umlaut used gratuitously by several actual bands.
Unicode
Neither "N̈" nor "n̈" are characters in the Unicode character set, and have to be represented as a letter "N" (or "n") and combining diaeresis U+0308.