I have a couple of blog/email friends who have helped to introduce me to the term Perichoresis. Theopedia defines it as:
I have also heard Perichoresis as the intricate dance of the Trinity. Dr. Baxter Kruger has a website called "The Parable of the Dancing God" with a link to a book of the same name.
Perichoresis is a Greek term used to describe the triune relationship between each person of the Godhead. It can be defined as co-indwelling, co-inhering, and mutual interpenetration. Alister McGrath writes that it "allows the individuality of the persons to be maintained, while insisting that each person shares in the life of the other two. An image often used to express this idea is that of a 'community of being,' in which each person, while maintaining its distinctive identity, penetrates the others and is penetrated by them."
Let me share an image that can be used to describe the concept.