Humanity created a ranking for the 999 strongest skills and artifacts. This ranking puts the strongest as solo numbering from 1-9. The slightly less powerful are given double numbering from 10-99. The less powerful ranking are given triple numbering from 100-999. Other skills weaker than this were not ranked.
Skilland artifacts that aremorepowerfulthan the currentsolonumberingbuthavenotyetbeenfound are called zeronumbering.
The <Numbering Series> were the most outstanding artifacts and skills that the humans had found out and numbered.
Within the <Numbering Series> are unique artifacts called Growing Artifacts that can continue to absorb runes and change their runes to the next level, just like the adventurers in the Otherworld. The stronger these Growing Artifacts become, the larger the gap between these and other artifacts become. These Growing Artifacts are sometimes called <Draconic Series> because it grew like a dragon. These were the strongest artifacts that even surpassed artifacts on higher levels of color.
The Manoros Clan created a ranking for the 999 strongest skills and artifacts of the Seven Zones. They had judged and chosen the strongest items of the ones found so far. The ranking didn't care whether it was a ring, an armor, or a weapon. You put them in a line and give them a number. This ranking puts the strongest as <Solo Numbering> from 1-9. The slightly less powerful are the <Double Numbering> from 10-99. The less powerful ranking are the <Triple Numbering> from 100-999. Other skills weaker than these are not ranked. The Numbering Artifacts are something that was determined after it had grown to the Violet stage.
The Numbering artifacts and skills were usually famous by themselves but they would get even more famous depending on who used them. Skill and artifacts that are potentially more powerful than the current solo numbering but have not yet been found by humanity are called <Zero Numbering>.
<Zero Numbering> skills are also called Skills of Annihilation. Those who gained these skills can potentially destroy an entire world with it or become an invincible being who can control the entire world. These are skills that only those who have been born into Transcendence could gain after proving themselves. There was some conditions to gain it: Fight until you get annihilated or destroy the entire world and swallow it whole. A tremendous amount of strength that one could only gain after overcoming various trials both internally and externally. If a person has multiple Skills of Annihilation, their soul will break unless they become Transcendents.
Quote from Chapter 53: The legacies that no one had numbered because no one had found them yet. <Zero Numbering>.
The top 3 Solo Numbering skills are comparable to the Zero Numberings and there isn't much difference in power between them. If the mastery of the top 3 Solo Numberings were higher, they'd be able to beat the Zero Numberings.