One of the most well-known is a 'Code Bravo,' which means that there has been a security breach/threat. In airports, security staff may issue the call 'Bravo, Bravo, Bravo' and order everyone to freeze, to help them identify a suspect.
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Travelers would be classified into one of three groups: green for good to go, yellow for investigate further and red for stop from flying.
Oscar, Oscar, Oscar is the code for man overboard aboard Royal Caribbean and Celebrity ships. Purell, Purell, Purell followed by a location is for cleanup (vomit) on Celebrity ships.