Dear Editor, Anyone familiar with the BellSouth Tower in Nashville, Tenn., will know that it is nicknamed the "Bat Building" because of its distinctive shape. On a recent visit to your fair city, my wife and I were struck by the singular configuration of the Frost Bank Tower, which was not yet complete last time we were in Austin. My wife, Cathy, immediately suggested calling this edifice the "Iceberg Building." Hope this will catch on, and remember you saw it here first! Best regards from (just outside) London, England.