ääkkönen

Etymology
A humorous front-vowel variant of, such that it contains both ä and ö (two letters used in Finnish but not in English; å is only really used for Swedish names). Probably initially coined for around the 1980s-1990s.

Noun

 * 1)  Any of the letters Å å, Ä ä or Ö ö, which are found in the Finnish alphabet, but not in the English one.