Then along comes the word tangleation which Rick and Maria define this way:
"tan-gle-a-tion (tan-gəl-ā-shən) noun
1. A noticeable variation of an existing tangle."
Read more about tangleations in the Zentangle newsletter here.
So, in fact, this is perhaps really a tangleation, not a whole new tangle. So much for my cool names for it, but it IS a cool tangleation!
UPDATE on May 16, 2011:
Based on encouragement from readers of this blog, I've decided to call this St. John's Cross and to consider it a new tangle.