The Arms of the Government of Gibraltar
These are the Arms of Gibraltar as used by the Gibraltar Government.

They consist of the Castle and Key symbols held under the Royal Coat of Arms of the United Kingdom of Great Britain and Northern Ireland.

This form of the Arms was initially adopted by the City Council of Gibraltar and later used by the Mayor of Gibraltar.
These arms can be seen over the Speaker's Chair at the House of Assembly and above the main entrance to the City Hall in John Mackintosh Square (the Piazza).
It is used by the Government of Gibraltar as part of the letterhead on official stationery.
Example of an official Government advert published in a local newspaper