IBN: re rate on its way.. hidden gem, page-128

A 'crossing' or 'crossed trade' is when a trade has resulted from matching a buyer and a seller of a particular stock, and the buyer and seller are clients of the same broker. An NXXT is a crossing that has occurred at the current NBBO (see definition below) price and has been reported to the ASX.

"National Best Bid and Offer (NBBO) is a regulation by the United States Securities and Exchange Commission that requires brokers to execute customer trades at the best available ask price when buying securities, and the best available bid price when selling securities."