spherical zone

Technically, they're points, but in practice they work out as a relatively spherical zone.

The surface of the spherical segment (excluding the bases) is called spherical zone.

The area of the spherical zone -which excludes the top and bottom bases- is given by:

Ten picoseconds after its creation, the shape of the warp twisted from a spherical zone to a twodimensional disk.

Opening its affinity full, projecting a wordless shout of joy and sorrow over a spherical zone thirty astronomical units in radius.

(We are implicitly assuming a perfectly spherical zone of sinful-ness expanding at velocity c with origin at time TO.)

When more electrons are added to a single atom, the additional electrons tend to more evenly fill in a volume of space around the nucleus so that the resulting collection (sometimes termed the atom's "electron cloud") tends toward a generally spherical zone of probability describing where the atom's electrons will be found.