#diacritical_mark__diacriticalmark__diacritic  a mark added to a letter to indicate a special pronunciation
  supertype:  mark.written_symbol  a written or printed symbol (as for punctuation); "his answer was just a punctuation mark"
  subtype:  accent_mark__accent  a diacritical mark used to indicate stress or (in some languages) placed above a vowel to indicate a special pronunciation
     subtype:  stress_mark  a mark indicating the stress on a syllable
     subtype:  acute_accent__acuteaccent__acute__ague  a mark (') placed above a vowel to indicate pronunciation
     subtype:  grave_accent__graveaccent__grave  a mark (`) placed above a vowel to indicate pronunciation
  subtype:  breve  a diacritical mark (u-curved) placed over a vowel to indicate a short sound
  subtype:  cedilla  a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s
  subtype:  circumflex  a diacritical mark '^' placed above a vowel in some languages to indicate a special phonetic quality
  subtype:  hacek__wedge  a diacritical mark (an inverted circumflex) placed above certain letters (such as c) to indicate pronunciation
  subtype:  macron  a diacritical mark (-) placed above a vowel to indicate a long sound
  subtype:  tilde  a diacritical mark (~) placed over the letter n in Spanish to indicate a palatal nasal sound or over a vowel in Portuguese to indicate nasalization
  subtype:  umlaut__dieresis__diaeresis__diaeresi  a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound

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