Keening

The keening whistle of the tea kettle signaled that the water had boiled.

The keening whistle of the teapot signaled that the water was boiling.

As the funeral procession passed by, the mourners let out keening wails of grief, filling the air with a somber atmosphere.

The injured bird emitted a keening cry, signaling its distress.

The chilling keening of the banshee sent shivers down the spines of those who heard it.