Spiritual Meaning:
A whistle can signify a spiritual summons and shares the significance of a wind instrument.

Psychological / Emotional Perspective:
A whistle may be heard and recognized in dreams about games. As a means of imposing control and training, it may be relevant as to how it is blown. For instance, if it is blown harshly, we may be being made aware that we have transgressed a known code of conduct.

Everyday Material Aspects:
A whistle being blown in a dream can mark the end of a particular phase of time. It can also sound as a warning to alert us to a particular event.