Femtoverses are small finite-sized verses within picoverses. They are not very common and are also very small. They are 2-dimensional (meaning only other 2D entities and verses can enter and directly interact).
Structure[]
The structure of a Femtoverse may vary depending on its size and the Picoverse it is located in. Usually, they are 2D (only technically, being just barely a string thick). They contain 2D planets, stars, and tiny black holes, as well as star systems and rogue planets. They also contain Attoverses, which even tinier verses than a Femtoverse.