Satori means the experience of awakening ("enlightenment") or apprehension of the true nature of reality. It is often considered an experience which cannot be expressed in words.
While the term satori is derived from the Japanese verb "to know" (satoru), it is distinct from the philosophical concept of knowledge as it represents a transcendence of the distinction between one that knows and knowledge. wikipedia 
Here is how DT Suziki explains satori:
> The essence of Zen Buddhism consists in acquiring a new viewpoint on life and things generally... Zen proposes to do this for us and assures us of the acquirement of a new point of view in which life assumes a fresher, deeper, and more satisfying aspect. This acquirement, how ever, is really and naturally the greatest mental cataclysm one can go through with in life. It is no easy task, it is a kind of fiery baptism, and one has to go through the storm, the earthquake, the overthrowing of the mountains, and the breaking in pieces of the rocks. > This acquiring of a new point of view in our dealings with life and the world is popularly called by Japanese Zen students "satori" (wu in Chinese). It is really another name for Enlightenment (anuttara-samyak-sambodhi), which is the word used by the Buddha and his Indian followers ever since his realization under the Bodhi tree by the River Nairanjana.
related to
pondering
Potential relationship between unconscious, primal, and meta consciousness, exploring the distinction between that which is for survival and that which is for creativity.
ensō
Agile Mindset, Believing Eyes, and Deep Listening as the 'ambiance' of creative consciousness.
We now become curious about the nature of creative consciousness as sensed in the relationship between the ensō, ma, and satori.
From Yoshiki Ohshima's profile:
> I had the great opportunity to closely work with Dr. Alan Kay and his group over the decades. They were thinking about questions like “what is computing?” in the “Koan-like” sense that “what is computing if you take away all hardware in front of your eyes?”, and “what does computing mean to humanity?” The group was not only talking about those things, but was also actually making those ideas concrete. source
The aim of the break-through koan is to see the "nonduality of subject and object" wikipedia
That which leads to satori.