- Mankind was created on the sixth day.
"Represent the imperfection, the sin, the Evil, according to the Bible. But it is also the number of the test, the work and the servitude in the Hebraic law, which ordered to work during six days, to sow the earth during six years and that a slave serves his master during six years."
"Perfect number, according to Thibaut Of Langres. Our Lord was conceived on the sixth day, was born at the sixth age of the world and was crucified on the sixth day - the eighth age corresponding to the beatitude which will follow the resurrection of the bodies. Origen specifies that 6 is the symbol of the passion of the Christ who suffered the sixth day. According to Euclid, 6 is also the first perfect number because it is equal to the sum of its aliquot parts."
-- http://www.ridingthebeast.com/numbers/nu6.php
- The Seal of Solomon (aka the Star of David) has six points.
"Six represents creation, because God created in six days, or imperfection, because it falls short of the perfect number seven." (from http://www.religionfacts.com/christianity/symbols/numbers.htm)