English: The British Union Jack flying aboard a decommissioned
Royal Navy ship moored in the river Thames in central London, July 2016. The flag is flying from the
jack staff of
HMS Belfast and, as customary for ships' flags, is twice as long as it is wide (proportions of 1:2). At the top of the jack staff, the corona navalis or
ships' crown of nautical heraldry is visible; all Royal Navy ships' heraldic badges also have this device.
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