The mark, name, and number of the beast (REV13:8) in St. John's vision is the well-known triskelion (three-legged foot-race) medallion-device of Sicily (a triangular island near Italy, in the Mediterranean Sea, wherein also was St. John's exilic Patmos); consisting in display of three legs connected at the hip, and unequally crooked angled bent for running (right-hand clockwise) each chasing the next cyclically. The two contiguous beams (thigh, shank, and connecting knee-hinge) of each leg comprise its essential combined extensive power, might, animus, strength; and figure as the Roman numeral, V=5; and the end foot (ankle-toggle to the shin-shank), its determined endurance, its ped-antry [SIC: footing] figured as the smallest unit numeral, I=1; and together, VI=6; whence its tricipherous, VI,VI,VI, equalling, the three numerals, 6,6,6. (The Nazi swastika was a tetra-skelion but without feet, numerically, 5,5,5,5, or in the Greek, 3,3,3,3, the tetragammadion). A modern day '666' mark might be as the seal, like a yin(6)-yang(6)-yun(6) - a three-tailed 'S' spiral closing back upon itself to complete a circle - whence the Chinese cosmic triumvirate emblem: female (might), male (cause), Christ (appointment/anointment): Mother-Father-God; and their familiarity with the great red dragon: yin-yang '69' only. (This common three- or four-legged spiral emblem may have its depictive origin in the occasion of a great comet spinning-off streamers, says one astronomer - subsequently three legs sufficed, as also three digits sufficed the Greek letter-arithmetic.)
St. John saw this trivial treblance [SIC: tri-balanced] (Greek) "Y" symbol as the will power and control of the beast rising up out from the sea (as the island). In three, in circle, it represents enslaved mentality, harnessed energy in ordinary perpetual motion, efficient (material) mechanism, adsorbing and absorbing all intellect: something rather new in prophecy: accelerated, pervasive, ubiquitous: displayed on coins, keys, medallions, (hubcaps eventually, gold plated and copyrighted for financial promotions of the beast), even (in) science-fiction movies; knowledge, running to-and-fro on the Earth; even the free-spinning Earth itself beneath the sun, moon, and stars. It also suggested to St. John the triune Principle and untiring progress of omnidirectional mankind: running and not wearying, walking and not fainting, (and in the case of his dear fellow Christian, Paul, talking long without getting tongue-tied). St. John was not enthused with this prospective free-wheeling mindless hierarchical church system propagation.
As it applies to The Mother Church, it includes the three* Trustees under the Will of Mrs. Eddy, who keep her book(s) in perpetuum for the Church and Publishing Society: their metaphysical purpose goes to the temporal entropy or basal motive of mankind where Mrs. Eddy's book is designed to last four hundred years of American-English language derivation (and grammatical reproof: see S&H369:26 was/were); and they are entrusted with this daily gambit of evil: the tri-umph [SIC] of the seal-coin at the corner, at the root of the three dimensional tree 'turning' spread in all directions, keeping mankind out of the 'garden': the three legs (main branches) are the book (reading-study), the church (demonstration-practice), and the society (testimony-literature) iterating ad infinitum, all three, public avenues of The Mother Church of Christ, Scientist: until ca. A.D. 2310, Christ Science's Imperial Church Universal and Triumphant, made manifest in the spiritual affections of mankind, and over the believers of matter on Earth.
In mundane afterthought, 666, counted by a beast, is six knocks, pause, six more, pause, six final, and wait: a simple knocking code for peaceable entry. (Christians of that era also relied on fish symbols to covertly reveal their intents). Scholars commonly add that 666 is the sum of letter (Greek or Hebrew) in the spelling of certain notoriously famous names, Nero(n), etc. ..., and, 'today' we recognize the digital electronic computers' representation of names in/by mathematically convenient code numbers, even to securely encrypting signatured text for financial transactions ... multiple coincidences in meaning catch more attention.
* [fitting these three to the other seven Trustees (may be) DANIEL's ten king-horns ... a small single (eleventh) horn then is to uproot those three (DAN7:8,19-25) - as the eleventh Commandment, THOU SHALT NOT STEAL-BACK, uproots three of Moses' Ten: no stealing, no idols, no coveting - Mrs. Eddy's successor takes charge of her Will: whence the number 616 may replace 666 in the seal-mark ... or (maybe) 1766 in a swastika X=10, was meant in the first place]
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