Three (3) is the first sacred number, the first perfect number (Westcott, p. 41). Three represents the Pagan Trinity." (Westcott, p. 37).
It is represented geometrically in the triangle, and spiritually as the Third Eye Of Hinduism. Occultists will multiply and add three to other sacred numbers to create new numbers. However, they also group threes in two's and threes, because they believe in the principle of "intensification", i.e., that greater power is achieved when a sacred number is grouped. In the case of three, greater intensification is achieved when it is shown as 33, or 333. 333 + 333 equals 666.
Occultists have used 333 as the hidden symbol by which they present the more offensive number 666. When the details of an event are so arranged as to contain certain sacred occult numbers or numeric combinations, this is literally an occult signature on the event. Mathematically, 666 can be created when three pairs of threes are added. Thus, (3+3) + (3+3) + (3+3) = 666. Now, eliminate the parentheses and the plus sign, and you have 33 space, 33 space, 33, representing the number 666.