There have been a lot of lexilinks and events tied to locations, symbols, and names reflective of Phoenix, lately.
In 2009, the Phoenix contribution was one of two chapters I wrote for a synchromystic tome of some significance from the twilight language gods. It was a surprise assignment for me, but one I enjoyed thoroughly.
An Illustrated Guide to The Lost Symbol is an anthology edited by John Weber, which might actually be better than the original Dan Brown novel. Besides the phoenix, I also talked of the coelacanth and giant squid to be found in The Lost Symbol via more in Weber's book. (Find it online for USA and UK.)
The lavishly, well-texted Random House opus has several important contributions that assist in examining the facts behind The Lost Symbol, supported with multiple details, and arcane and current images.
The book's score of authors share their unique insights on the various twilight and synchromystic threads running throughout The Lost Symbol, already seen and those of some as yet unseen.