Translation of this article.
The acronym for Static Hymmno Wave, or static mental wave.
As this refers to the [souls] and [lifeforce], it also refers to matters like the life memories and personality an individual has.
They are mainly used as the [energy source] for the singing of Song Magic.
Since Song Magic utilizes emotional strength as its basis, if too many of these waves are used in the process, the user will faint.