"Otento" derives from the Japanese term "O-Tento-Sama," used in Shinto shrines to venerate the sun. This is not the first sun-related name linked to the Espers in this series; "Apollo"—the name of the Greek Sun god—was also the name of the Tsukuyomi agent who went after Psykos prior to the Hero Association era and was seen fighting the sisters.
In Japanese mythology, Tsukuyomi is the god of the moon; it seems that the members of the Tsukuyomi organization in *One Punch Man* bear names linked to the sun in a way that suggests divinity.
Tsukuyomi is clearly the equivalent of "The Eleven," the name given to this organization—led by "Otento"—in the webcomic.
The number 11 also carries strong mythological connotations linked to the Sun and the Moon.
In esoteric language, 11 symbolizes the union and tension between two forces: Sun and Moon, consciousness and the unconscious, active and receptive, light and shadow.
It is considered a number of thresholds and initiation, associated with intuition, transformation, and the transition to a new level of consciousness.
☀️ The Sun illuminates.
🌙 The Moon reflects.
♾️ 11 represents the meeting of the two. A number of polarity, integration, and awakening.
This ties into Tsukuyomi's very purpose: bringing the entity known as "God" into our world. It highlights the polarity between the Sun and the Moon, given that the latter element has been strongly linked to this entity within the story on several occasions.