The term 'School of Thought' refers to a group of people who share similar ideas and beliefs. The two crossword solutions for this term are ISM (3 letters) and DOCTRINE (8 letters). ISM is a suffix that is used to refer to a system of beliefs or principles, while DOCTRINE is a set of beliefs or principles that are taught or advocated. Both terms are used to describe a particular school of thought, which is a group of people who share similar ideas and beliefs.