Po Tolo (Sirius B) is the oldest of stars, and its name means ‘deep beginning’. It is a twin of the Po – the Black hole at the center of the galaxy.

"7. Behold, oh Lanoo ! The radiant child of the two, the unparalleled refulgent glory : Bright Space Son of Dark Space, (black & white hole) which emerges from the depths of the great dark waters. It is Oeaohoo the younger, the * He shines forth as the son ; he is the BLAZING Divine Dragon of Wisdom (Sirius); the One is Four, and Four takes to itself Three,† and the Union produces the Sapta, in whom are the seven which become the Tridasa (or the hosts and the multitudes).
Secret Doctrine, Vol 1 pg 29

Po - Dogon

The Dogon name for Sirius B (Po Tolo) consists of the word for star (tolo) and "po," the name of the smallest seed known to them. By this name they describe the star's smallness -- it is, they say, "the smallest thing there is." They also claim that it is "the heaviest star," and white.

The most secret traditions of the Dogon all concern the star which the Dogon call after the tiniest seed known to them, the botanical name for which is Digitaria, and which is thus used in the article as the name of the star instead of the actual Dogon name, po.

Digitaria / po (Sirius B)

"the path of the mask (is the star) Digitaria the path runs (like) Digitaria.
'Digitaria is the smallest thing there is. It is the heaviest star:''52

The Axis

The movement of Po Tolo keeps all other stars in their respective places: in fact, one says that without this movement none of them would "stay in place". Po Tolo forces them to keep their trajectory…One calls it the "pillar of the stars"…. Po Tolo is the axis of the entire world…

Creation of the Po or The Po as a Nebula

"Thus inside the egg Amma himself was like a spralling motion, called "accelerated ball", ogoru gunna; then the oval po seed was created which placed itsef invisibly at the center.

It is said: "When Amma broke the egg of the world and came out, a whirlwind arose. The po, which is the smallest (thing) was made, invisible at the center: the wind is Amma himself. It is the po which Amma let come out first" Amma's creative will was located in the po, the smallest of things. Like a central bubble, it spun and scattered the particles of matter in a sonorous and luminous motion which, however remained inaudible and invisible. It was less a word than a thought.

... "the beginning of things is Amma's greatest secret" ... the po is also the image of the creator Amma. ... when he created all things, each was like the po; they grew larger but the po did not; the seed was formed like wind and it is forbidden to talk about it."

The seed is in a fashion a "living testimony of the air" that is the proof of Amma himself who, at the beginning, was comparable to the whirlwinds, today's visible elements. It is called po, a word considered to have the same root as polo, "beginning".

Amma makes things begin by creating them as small as the po. He continues to add to the things created little by little, that thing (thr element as infinitesimal as the po. As Amma adds that (elements of the seed) the thing becomes large."

"When life increases, it increases by whirling", which is a repetition of Amma's first act, because "that imitates how Amma came out of the egg of the world." The Pale Fox pg 132-4

Po - A Black Hole

"The Po is the Black Hole that is the core of our galaxy. The Po is ‘The Egg of the World’, the first principle of the seed. Po means seeds in the Dogon language. The Dogon describe the Po as the smallest thing in the world, alluding to the fact that the matter of a Black Hole is the densest, most compact form of matter in creation. They say that it is ‘invisible, at the center’. It spins and scatters all particles of matter in a sonorous and luminous motion, yet remains inaudible and invisible. The Dogon say that Amma placed his word in the Po, thus making it the ‘image of the creator’ and ‘the womb of Amma’.

Po Tolo is ‘The Star of the Deep Beginning’. This is what the Dogon call the Black dwarf Star that astronomers call Sirius B. Po Tolo is the 1st of all stars; it was born after the Po (galactic core) had finished its task. Po Tolo is seen as a double of the Po, meaning that Black stars such as Sirius B act very similar to Black Holes; it appears as if it has the same effect on space and time as Blacks Holes, only on a much lesser scale of manifestation. Po Tolo is the ‘image of the womb of Amma’ and is seen as a reservoir of source of renewing life force for this realm of creation (Po Tolo is the 2nd closest star system to our solar system; being only eight light years away). Po Tolo is also made of the smallest and heaviest of things, which the Dogon describe as a metal called Sagala. One pebble of Sagala would weigh several tons. Because Po Tolo is so massive it shapes and moulds the structure of space and time in our realm."
https://in5d.com/the-dogon-tribe-and-their-visitors-from-the-sirius-star-system/

"... they even recognized the Sun as the “brother system” of Sirius. They claim that these two systems got separated to form two different star systems but with one identical origin. Just how did they manage to obtain this knowledge?"

Nommo

"The Nommo or Nummo are primordial ancestral spirits in Dogon religion and cosmogony (sometimes referred to as demi deities) venerated by the Dogon people of Mali.[1] The word Nommos is derived from a Dogon word meaning "to make one drink." Nommos are usually described as amphibious, hermaphroditic, fish-like creatures. Folk art depictions of Nommos show creatures with humanoid upper torsos, legs/feet, and a fish-like lower torso and tail. Nommos are also referred to as “Masters of the Water”, “the Monitors”, and "the Teachers”. Nommo can be a proper name of an individual or can refer to the group of spirits as a whole." Wikipedia

Oannes

"As the Babylonian accounts are restored from hundreds of thousands of broken fragments, the proofs here cited are comparatively scanty; yet such as they are, they corroborate almost every one of our teachings, certainly three at least. These are (1) That the race which was the first to fall into generation was a dark race (Zalmat Gaguadi), which they call the Adami or dark Race; and that Sarku, or the light Race, remained pure for a long while subsequently. (2) That the Babylonians recognised two principal Races at the time of the Fall, the Race of the Gods (the ethereal doubles of the Pitris) having preceded these two. These "Races" are our second and third root-races. (3) That the seven (primeval) Gods, each of whom created a man, or group of men, were "the gods imprisoned or incarnated." All these gods or "Lords" collectively "who bestow Intelligence" are our incarnating Dhyan Chohans, connected as well with the Elohim, and the seven informing gods of Egypt, Chaldea, and every other country. Hea, their synthesis, the god of Wisdom and of the Deep, is identified with Oannes-Dagon, at the time of the fall, and called (collectively) the Demiurge, or Creator.

Our races, all cosmogonies show, have sprung from divine races, by whatever name they are called. The Chaldeans had their ten and seven Anedots, which was the generic name for their Dragons of Wisdom. The name of the Dragon in Chaldea was not written phonetically, but was represented by two monograms, probably meaning, according to the Orientalists, "the scaly one." We find the priests assuming the names of the gods they served, the "Dragons" held throughout all antiquity as the symbols of Immortality and Wisdom, of secret Knowledge and of Eternity. The allegory of Oannes, the Anedot, reminds us of the Dragon and Snake-Kings; the Nagas who in Buddhist legends instruct people in wisdom on lakes and rivers, and end by becoming converts to the good Law and Arhats. Musarus Oannes, the Anedot, known in the Chaldean "legend," transmitted through Berosus and other ancient writers as Dagon, the "Man-Fish," came to the early Babylonians as a reformer and an instructor. Appearing from the Erythraean (Red) Sea, he brought them civilization, letters and sciences, law, astronomy, religion, teaching them agriculture, geometry, and the arts in general. There were Anedoti who came after him; but Musarus Oannes was "the first to appear, and this he did in the reign of Ammenon, the third of the ten antediluvian Kings whose (divine) Dynasty ended with Xisuthrus, the Chaldean Noah." The meaning of the allegory is evident. The "fish" is an old and very suggestive symbol of the Mystery-language, as is also "water;" Hea was the god of the sea and Wisdom, and the sea serpent was one of his emblems, his priests being "serpents" or Initiates. The hidden meaning becomes clear to the Occultist once he is told that "this being (Oannes) was accustomed to pass the day among men, teaching; and when the sun had set, he retired again into the sea, passing the night in the deep, for he was amphibios," i.e., he belonged to two planes, the spiritual and the physical. ... Oannes is dimly reflected in Jonah, and even in John the Precursor, both connected with Fish and Water. Layard showed long ago that the "fish's head" was simply a head gear, the mitre worn by priests and gods, made in the form of a fish's head, and which in a very little modified form is what we see even now on the heads of the high Lamas and Romish Bishops. Osiris had such a mitre. The fish's tail is simply the train of a long stiff mantle as depicted on some Assyrian tablets, the form being seen reproduced in the sacerdotal gold cloth garment worn during service by the modern Greek priests."
https://blavatsky.net/Wisdomworld/additional/ListOfCollatedArticles/TheChaldeanLegend.html
https://www.youtube.com/watch?v=BZ5xwdqHTE4
https://www.youtube.com/watch?v=hcHZkKf3JsA