Here are a couple of frequently asked questions, taken from the Dianetics website:
What is Dianetics technology?
The word Dianetics comes from the Greek dia, meaning "through" and nous, meaning "soul", and is defined as "what the soul is doing to the body."
Dianetics is a methodology which can help alleviate unwanted sensations and emotions, irrational fears and psychosomatic illnesses (illnesses caused or aggravated by mental stress). It is most accurately described as what the soul is doing to the body through the mind.
What is the Significance of the Dianetics Symbol?
The Dianetics symbol uses the Greek letter Delta as its basic form.
The stripes are green for growth and yellow for life.
The four green stripes represent the four subdivisions of life which are delineated in Dianetics.