the "z" on the note is one of the coded symbols in the music score. It refers to the processing of reducing a note by a semitone, that is, dropping it by a semitone. In music creation and performance, rising and falling tones are extremely common skills. The use of "z" to indicate flat semitone will not complicate the score in performance, but also improve the expressive force of performance.

In pop music, "z" is often used to represent a unique sound effect. For example, in electronic music, the "filter" changes all high-frequency tones into low-frequency tones, which will produce a sound full of tension. At this time, we usually use symbols like "zzzzz" to represent it. In addition, "Z" can also indicate the effect of staccato and making music more dynamic.

"Z" is not only one of the common symbols in music, but also can be extended as a way to express "concern". For example, in social networks, netizens often use "z" to express their concern and approval for something. This simple and classic expression not only distinguishes the concerns immediately, but also brings more convenience for information dissemination. Through the symbol "Z" with high popularity, the efficiency of information transmission has also been improved.