The Tenth Doctor identified the green moon as a universal symbol for hospitals. (TV: New Earth)
Goronwy Siencyn of the Pan-Wales Culture, History, Sport, Industry and Heritage Institute stated that Cardiff Castle was a symbol of English oppression and so supported Lord Mayor of Cardiff Margaret Blaine's plan to demolish it in favour of Blaidd Drwg. (PROSE: The Western Mail, TV: Boom Town)