Pythagorean square or "Psychomatrix" gives a chcracteristic according to the date of birth. It was developed by Pythagoras in the 5th century BC and was developed by his followers. The basic idea of psychomatrix is that the date of birth has a certain combination of numbers, with the help of which the human psychological type can be described. Each number from 1 to 9 symbolizes a certain quality and depending on the frequency of repetitions strengthens them.