As the product of the two sacred odd numbers seven and nine, sixty-three has a tidy structure that reinforces its sense of a complete arrangement, and its reduction to nine ties it to fulfilment. Beyond the sixty-three tractates of the Mishnah and the sixty-three Nayanars, the number carries little independent symbolism, and modern numerology reads it simply through its nine root. Its two genuine traditional uses, one rabbinic and one Shaiva, are both complete and canonical sets, which is a fitting role for seven times nine.
Where the Chaldean chart and the Balliett-descended chart assign different values to the same letters, a name totalling one figure in one system need not total the same figure in the other, since the two rest on unrelated letter-value tables rather than on a shared inheritance from any single ancient source.
The whole apparatus of digit-reduction numerology is a twentieth-century invention rather than an inheritance from antiquity. Mrs. L. Dow Balliett published the first systematic version, The Philosophy of Numbers, in 1908, fixing the letter-to-number chart still used today and ruling that eleven and twenty-two must stand as master numbers rather than reduce further; her colleague, the physician Julia Seton, is credited with coining the word numerology itself around 1912.