theta: energy peculiar to life which acts upon material in the physical universe and animates it, mobilizes it and changes it; natural creative energy of a being which he is free to direct toward survival goals. The term comes from the Greek letter theta (), which the Greeks used to represent thought.
thetan: an immortal spiritual being; the human soul. The term soul is not used because it has developed so many other meanings from use in other religions and practices that it doesnt describe precisely what was discovered in Scientology. We use the term thetan instead, from the Greek letter theta (), the traditional symbol for thought or life. One does not have a thetan, something one keeps somewhere apart from oneself; one is a thetan. The thetan is the person himself, not his body or his name or the physical universe, his mind or anything else. It is that which is aware of being aware; the identity which IS the individual. See Chapter 4.
time track: the consecutive record of mental image pictures which accumulates through a persons life. It is a very accurate record of a persons past. As a rough analogy, the time track could be likened to a motion-picture film if that film were three-dimensional, had fifty-seven perceptions and could fully react upon the observer. See Chapter 4.
TRs: abbreviation for training routines, practical drills which can greatly increase a students ability in essential auditing skills, such as communication. See Chapter 15.