What is the meaning of Accent_mark?

A diacritical mark or character used in writing to indicate the place of stress (spoken accent), or to indicate the nature or quality of the vowel marked (such as long vowel versus short vowel).

Any diacritical mark.

A mark used to represent specific stress on a note.

A mark placed after a letter designating a note of music to indicate the octave in which it occurs.

A prime symbol.

Source: wiktionary.org