Scientology Symbol is composed of a letter S that links two triangles that point in the same direction. The S stands for Scientology, and each of the triangles represents three tenets of the philosophy of Scientology. The upper triangle is called the KRC that stands for (Knowledge, Responsibility and Control. The lower triangle is ARC that stands for (Affinity, Reality and Communication. The symbol got first used in 1952.
Nozedar Adele, The element encyclopaedia of secret signs and symbols, 2008, Scientology symbol, p 173