Whether you view him as a masterfully written antagonist or a missed opportunity, "C" remains a fascinating footnote in Bond history—the man who tried to kill 007 with a memo.
While in real-life British intelligence, "C" is the traditional codename for the Chief of the Secret Intelligence Service (MI6), in the film, it is used as a formal, insulting designation by Bond. Bond implies that "C" stands for "Careless," referencing Denbigh's lack of regard for human life and loyalty. James Bond Spectre C