Monoabolo
A Monoabolo is a shape made out of 1 half-cube, thus there is is only one Monoabolo, The Monoabolo.
The Monoabolo has one half-cube for its shape, so in 2d it woud be a unit right triangle:
The Monoabolo has one half-cube for its shape, so in 2d it woud be a unit right triangle: