The Chaldeans were ancient people who ruled Babylonia from 625 to 539 BC. Therefore, this system is also known as the Babylonian numerology system. Chaldean numerology is used to recognize the energy changes that occur when you or someone else speaks or thinks. The sound of someone speaking comes out in vibrations of different frequencies that affect the speaker and those around them. The Chaldean system uses the numbers 1–8. The number 9 is not used in the system because it is regarded as sacred due to its connection to infinity. The Chaldean system uses this 1–8 number system on the name that the individual is currently using because that is the energy that would currently be projected. Then, each letter is assigned to a number one to eight, based on the Chaldean numerology chart. The numbers are assigned to letters of the Latin alphabet as follows: