What is meant by ‘Subtle’ ?

The physical aspects of an individual are the five sense organs – the nose, ears, eyes, tongue and skin. These five senses, beyond the mind and intellect, are ‘subtle’. These ‘subtle’ sensations are felt by some people who have advanced in their spiritual practice. ‘Subtle’ is that which is beyond the comprehension of the five sense organs, mind and intellect. Various Scriptures contain references to subtle knowledge.