Islam, Muslim fundamentalism, Islamism and jihadism. A terminological clarification.

A synthetic terminological clarification, by the founder of the British think tank Quillian Foundation, that we can apply also in its Italian translation and to which I would add the misuse of the term "radical" in the Anglo-Saxon press for radicalized individuals. Let 'radicals' indicate positive figures like Mandela, Malcolm X, Gandi... please!