Three letter ticker on the NASDAQ:
We all know that a way to differentiate the two major exchanges were by a first glance look at the number of letters in the ticker. Just in case you come across a three letter ticker that is trading on the nasdaq, this is why:
Last July, the SEC approved a measure under which companies that already had a three-letter symbol on another exchange could migrate to the Nasdaq and continue using it. The new rules specifically discussed three-letter tickers, not those with one or two -- so although you shouldn't expect too much change, you can also expect three-letter symbols to begin proliferating at the Nasdaq.