x_{1} is the whole region of space which is between inner sphere x_{2} and outer sphere x_{3}.

x_{1} canlu. The two spheres need not be mutually concentric, but x_{3} should enclose at least some portion (and probably: most) of x_{2} and, without loss of generality, x_{3} should be radially larger than or congruent to x_{2}; if x_{2} is not fully enclosed by x_{3}, then the result is the convex hull formed by them or some smoothed version or inflation thereof, minus every point enclosed by x_{2} (and possibly minus x_{2} itself). Containment, by x_{1}, of any points belonging to the (surfaces) of x_{2} or x_{3} is left vague and may be specified by additional description. Contrast with "jinrcaibyca'u", which a thin toroidal region enclosed by a bolbi'i (under the assumption of nesting: x_{2} being wholly enclosed by x_{3}) and confined approximately to a plane intersecting therewith (and which nearly requires complete enclosure of x_{2} by x_{3}). Just use "jbini" with a path or interval defined by the centers or mutually-nearest surface points of x_{2} and x_{3} if x_{2} is not at least partially enclosed by x_{3}. Use "neryrelbolbi'i" if you want to be extremely clear in meaning.

- jinrcaibyca'u
- x
_{1}is a region/room/volume of space which is shaped like a washer (or thin or flattened torus/toroid), between inner disk/sphere x_{2}and outer disk/sphere x_{3}, defined by midplane x_{4}, and containing x_{5}.