There are many types of Abstract Planets. The more "studied" are two variants: the Abstract Planets of Milegu (the most characteristic) and the Abstract upandu Planets.

"Abstract Planets" can mean another things, like a conceptual planet. That is not the principal use in Milegu.

The Abstract Planets in Milegu

The Abstract Planets in Milegu are formed due to the ∞p (infinite-paradoxes) or by the interference of the ∞p-Milegu in the 0-Milegu. There are millions and millions of peculiar planets (actually infinite) that doesn't resemble normal planets at all. They usually have geometrical drawings across their surface and with a totally smooth surface. Even, there are patterns that are considered "characteristic" of the Abstract Planets.

Of course, not every Abstract Planet are uninhabited as there are living creatures that are able to survive in such environments.

Some examples of Abstract Planets are: the Hyÿr Planet, the Ixhkloh’ki Planet, the Qwun Planet, the Akim-Hwygo Planet, the Nurpissa Planet, the Owyaunu Planet, the Holosiënnya Planet, the Mallyaxa Planet, the Wabijeerjbij Planet, the Ssbauyjsi Planet, the Evvul Planet, the Hurminiwa Planet, the Hullandwa Planet or the Nurudsiwa Planet.

The Abstract Planets are more susceptible to interact with different Planar Structures, like being absorbed by the Interplanar Fabric (like Wabijeerjbij), by Interplanar Xones (like Nurpissa) or do Yumps [in spanish Xaltos] (movements of great masses through Qroses [Qroses are a generic word for all kinds of portals). A lot of them are or were in any Shain [word for connected worlds, like a hain], like the Ilimited Frozen Shain of Nermecodi (as Ssbauyjsi, Evvul, Hurminiwa, Hullandwa or Nurudsiwa) or in the Limited Frozen Shain of Xhaawü I or Xhaawü II (like Nurpissa, Owyaunu, Holosiënnya or Mallyaxa).

Of the Abstract Planets appointed, some are inhabited, while others have been in the past.
The Hullandwa Planet is placed at Nermecodi and is part of Tellwoghtissos Empire. In that planet lives the Red Lions of  Hullandwa.

Wabijeerjbij had a large population, but was abandoned desperately before being absorbed by the Interplanar Fabric. Now, wanders eternally through huge corridors that sometimes are formed in the Interplanar Fabric.

Previously, Fractal Planets (as Nurpissa) and Abstract Planets were categorized independently, but the discovery of Planet Hyÿr, which has characteristics of both Fractal and Abstract planet, depending on the angle from which is look, changed the classification.

It must be avoid it to confuse Abstract Planet with Wanderer Planets or with Pseudoplanets.

Wandering Planets are spheres of small size that wander through space without being affected by any fundamental force and some say guided by inexplicable motivations: they can pass through star or wander aimlessly across the surface of a planet.

The Pseudoplanets are spherical agglomerations that can be resemble (from a distance) planets, but they actually aren't. Unlike the Abstractal Planets, the Pseudoplanets have in common between them their inestability in shape and composition. I.e. while the Abstractal Planets are planets with peculiar features (like their totally smooth surface), the Pseudoplanetes can be everything that have the correct size and spherical shape over a period of time. However, although during this time seems to be a planet, actually it is not, and it can transform itself in something totally different in any moment.

One of the known Psuedoplanets is Paralavi.

The Abstract upandu Planets

The other kind of Abstract Planets are the Abstract upandu Planets. These Abstract Planets are not peculiar from the point of view of their appearance but in their spatiotemporal location. The Abstract upandu Planets are closely linked to the Ewdtia Planet and its inhabitants that, one way or another, have created them with their imagination. Other Abstracts Planets near Ewdtia have appeared spontaneously.

The more known are the Vekkhoasi Planet or the Tpahkitleu Planet.

Vekkhoasi is closely linked to the uaaimqyb religion of the Purplish Upandu of Wonore. For them Vekkhoasi is the perfect place where they shall rest eternally. The difference with other havens is that Vekkhoasi has a multiple nature and is not only within each Purplish Upandu but all Purplish Upandu make possible the existence of Vekkhoasi: it is both within each individual and outside all them.

To reach that planet once they are dead they must travel through an infinite labyrinth and only his courage, knowledge and courage enable them to reach Vekkhoasi.
This planet was instrumental in the spread of uaaimqyb religion since the Purplish Upandu believed that the stronger Vekkhoasi were and greater number of uaaimqyb believers have, the easier it would be for all Purplish Upandu to reach Vekkhoasi.

YANU.Atarakiuxean.Tesaran , a.k.a. Atarak, an important Purplish Upandu traveled to 20 Abstract upandu Planets, each ruled by a virtue.

The Tpahkitleu Planet was where the Hrýss Grandmasters settled and from where they directed their tactics to influence Ewdtia. Some Mystics Upandu, known then as Àivosi, were probing the reality near Ewdtia and its nearby Abstract Planets when contacted with the Two Masters.
The History of the Upandu, of Értrad (the continent formed of continent-island of enormous size) and Ewdtia, totally changed because of it.