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The Greek word signifies, literally, the number four, and is therefore synonymous with the quaternion; but it has been peculiarly applied to a symbol of the Pythagoreans, which is composed of ten dots arranged in a triangular form of four rows. This figure was in itself, as a whole, emblematic of the Tetragrammaton, or sacred name of four letters, for tetractys, in Greek, means Jour, and was undoubtedly learned by Pythagoras during his visit to Babylon. But the parts of which it is composed were also pregnant symbols. Thus the one point was a symbol of the Active Principle or Creator, the two points of the Passive Principle or Matter, the three of the world proceeding from their union, and the four of the liberal arts and sciences, which may be said to complete and perfect that world.

This arrangement of the ten points in a triangular form was called the tetractys or number four, because each of the sides of the triangle consisted of four points, and the whole number of ten was made up by the summation of the first four figures, 1 + 2 + 3 +4= 10.

Hierocles says, in his Commentaries on the Golden Verses (v, page 47): "But how comes God to be the Tetractys? This thou mayst learn in the sacred book ascribed to Pythagoras, in which God is celebrated as the number of numbers. For if all things exist by His eternal decrees, it is evident that in each species of things the number depends on the cause that produces them.... Now the power of ten is four; for before we come to a complete and perfect decade, we discover all the virtue and perfection of the ten in the four. Thus, in assembling all numbers from one to four inclusive, the whole composition makes ten," etc.

Dacier, in his notes on these Commentaries and on this particular passage, remarks that "Pythagoras, having learned in Egypt the name of the true God, the Mysterious and Ineffable Name Jehovah, and finding that in the original tongue it was composed of four letters, translated it into his own language by the word tetractys, and gave the true explanation of it, saying that it properly signified the source of nature that perpetually rolls along."

So much did the disciples of Pythagoras venerate tetractys, that it is said that they took their most solemn oaths, especially that of initiation, upon it. The exact words of the oath are given in the Golden Verses, and are referred to by Jamblichus in his Life of Pythagoras.

I swear it by Him who has transmitted into our soul the sacred tetractys The source of nature, whose course is eternal.

Jamblichus gives a different phraseology of the oath, but with substantially the same meaning. In the symbols of Freemasonry, we will find the sacred Delta bearing the nearest analogy to the tectractys of the Pythagoreans.

The outline of these points form, it will be perceived, a triangle; and if we draw short lines from point to point, we will have within this great triangle nine smaller ones. Doctor Hemming, in his revision of the English lectures, adopted in 1813, thus explains this symbol:

The great triangle is generally denominated Pythsoorean, because it served as a principal illustration of that philosopher's system. This emblem powerfully elucidates the mystical relation between the numerical and geometrical symbols. It is Composed of ten points so arranged as to form one great equilateral triangle and at the same time to divide it into nine similar triangles of smaller dimensions. The first of these, representing unity, is Called a monad, and answers to what is denominated a point in geometry, each being the principle by the multiplication of which all Combinations of form and number are respectively generated. The next two points are denominated a dead, representing the number two, and answers to the geometrical line which, consisting of length without breadth, is hounded by two extreme points. The three following points are called the triad, representing the number three, and may be considered asks having an indissoluble relation to all superficies which consist of length and breadth, when Contemplated as abstraeted from thickness. Doctor Hemming does not appear to have improved on the Pythagorean symbolization.

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