Quarter-tone notation in Western music is not standardized. A common notation involves writing the fraction 1/4 next to an arrow pointing up or down. Below are examples of an alternative notation:
Lowers the pitch of a note by one quarter tone. (Another notation for the demiflat is a flat with a diagonal slash through its stem. In systems where pitches are divided into intervals smaller than a quarter tone, the slashed flat represents a lower note than the reversed flat)
– Sharp-and-a-half (sesqui-sharp)
Raises the pitch of a note by three quarter tones. Occasionally represented with two vertical and three diagonal bars instead. Other conventions for microtonal music are used on an ‘ad hoc’ basis.