A porpoise is another of those unique images that can have meaning beyond its own characteristics, qualities and nature. As for those aspects it is a creature that breathes air, but thrives on and needs a watery (often a symbol of the spirit) environment in which to live. It can go to great depths, fights off predators and is highly intelligent. As a homophone this image can also relate to the concept of "purpose".
* Symbol meanings provided by www.mydreamstories.com should not be used as a dream dictionary. They are for reference only and both dreamer and interpreter should be careful to listen to the voice of Holy Spirit as to what any particular symbol means in any specific dream