It is implied that are a total of eleven Sephirot (sing. Sephirah) per world.
There are a total of ten Sephirot according to Kabbalah, a religious school of thought.
For more information on Sephirah in the real world, see Sephirot
Ente Isla's Sephirot
Originally, the complete personification of Ente Isla's Yesod Sephirah was Kael. At some point since then, Yesod was stolen and shattered into fragments, which each took on their own personifications. Alas=Ramus, Acies=Ara, and the Evolving Holy Sword "Better Half" are among the fragments of Yesod.
Iron is the personification of Ente Isla's Gevurah Sephirah.
Utsushihara is the personification of Ente Isla's Daath Sephirah.
Alas=Ramus has mentioned Keter, Binah, Tiferez, Netzach, and Hod when looking at a minivan ad with differently colored balloons.
Amane mentioned having an Uncle George, Earth's Chesed Sephirah, in Cairo.
Miki Shiba is the 11th Sephirah for Earth's Tree of Life.