The significance of cornerstone number is that it reveals, when interpreted, your views on the material as well as the spiritual aspects of life. In fact, the cornerstone letter of an individual, i.e. the initial letter in his/her name has a lot to do with regard to the determination of the characteristic features of an individual. What the cornerstone letter and the cornerstone number influence most, is the attitude of an individual towards life. Cornerstone number is a very important number in numerology. Corner stone number is the numerological number that is associated with the initial letter of your name. This first letter of your name (the name you usually go by) is your Cornerstone Letter. Both cornerstone number and cornerstone letter are similarly significant since both of them reveal a great deal about the nature, character and personality traits of a person.