His company names all ended in an X—EBX, OGX, MMX—because in numerology, X stands for the multiplication of wealth.
(For devotees of numerology the weakest seasons seem to come every third year–3, 6, 9).
1911, "study of the occult meaning of numbers," a hybrid from Latin numerus "a number" (see number (n.)) + Greek -logia (see -logy). A correct formation would be arithmology, from Greek arithmos "number." Related: Numerological; numerologist.