A number: one value, or a field whose value changes from point to point. A Solid fits a Number input as its distance field.
An input that takes a Number also takes a Bounding Box, a Plane, a Solid, a Lattice and a CAD Face.
A Number also fits an input that takes a Solid.
The value rounded up to a whole number.
The value rounded down to a whole number.
The value with its sign flipped.
The value rounded to the closest whole number.
The value as a field with the same value everywhere.
This value in a Number List of one.
The number itself (kept for documents that read a whole number as a real one).
The number written out as text.
When a Number varies over space.
The field read as a Solid whose surface is where the field is zero.
The box the field is evaluated in.
The field with its sign flipped (−f), which swaps inside and outside.
The field divided by its gradient length (f/|∇f|) so it reads close to a true distance; the zero set does not move.
Items that are each a Number. One Number wired where a list is taken counts as a list of one. A list wired where one Number is taken runs the block once per item.